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Mechanical pulping

Mechanical pulping has a long history in Sweden. The term "mechanical pulp" includes TMP (thermomechanical pulp), CTMP (chemi-thermomechanical pulp) and groundwood pulp.

At Innventia we – together with our daughter company PFI – have in-depth long experience of development in this area, especially:

  • improving pulp quality
  • reducing the demand for electrical energy in the refining process – the main cost of mechanical pulping

Our strategic goal is to increase the use of mechanical pulps by:

  • improving the furnish properties for use in more competitive products
  • lowering the demand for energy in the pulping process

Equipment for LC (low consistency) refining is an important tool for us in optimising the energy consumption in the TMP process.


Lennart Salmén
+46 768767340
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The effect of process conditions on pulp quality development in low consistency refining of mechanical pulp – TMP
Hammar, L.-H., Salmén, L., Sandberg, C., Sundström, L. (2009) Appita 63(2010) 5:377-380

Shear/compression of chips for lower energy consumption in TMP-refining
Viforr, S., Salmén, L. (2008)
Appita 61(1):49-55

Optimal shear/compression forces: a way of collapsing coarse TMP fibres
Viforr, S., Salmén, L. (2007)
J. Pulp Pap. Sci. 33(1):22-28