Impurities

Problems with stone cells, spots or fines?

Stone cells 

Aspen or spruce are two species which contain stone cells. When changing wood raw material or using new wood species it is important to know how the process is affected in order to minimize the problems with stone cells.

Through a combination of analyses using a light table and a light microscope the presence and type of stone cells can be determined. Results from different pilot or mill scale tests can easily be quantified and monitored, and the customers learn how the problems can be mastered.

Dirt and fines 

When identifying and quantifying spots and fines, a light table, light microscopy and scanner based analyses are very valuable, of course in combination with the staff's experience.

When rebuilding e.g. the screening process or other processes in the pulp line or stock preparation department, we are sent pulp samples for analyses of impurities. Usually we receive a wet pulp or furnish out of which we make sheets in the laboratory in order to be able to count the amount of fines and spots. The standardized methods we use are ISO 5350-1, ISO 5350-2, ISO 5350-3 as well as T 213. The more information we get about the problem and the process the easier it is for us to give the customer a good answer that is directly related to the process itself.

Contact: Robert Selling, +46 70 522 73 99, E-mail

Process Solutions

If you need to discuse process solutions please contact:

Chemical recovery and environmental investigations: Staffan Magnusson +4670-222 31 32, E-mail

Bioraffinery: Hans Grundberg, +4670-527 41 05, E-mail

Paper Process: Lars Sundvall, +4670-526 52 21, E-mail

Dissolving och Cellulose Derivatives: Hanna Rammsy, +4672-500 66 09, E-mail

Wood: Torbjörn Sjölund, +4670-658 58 21, E-mail