Subproject 2

Save favourite 24 Mar March 2016

Measurement techniques that with sufficiently high resolution describe the load distribution in refiner zones.


To be able to get further insight into the details of the mechanical pulping process it would be beneficial to be able to measure as many relevant parameters as possible. Techniques are available to measure e.g. pressure, temperature and plate gap. One parameter of particular interest is how the mechanical power input is distributed over the refining plate. Sensors for measuring the tangential force in the plate gap (which will give information of the power distribution) have been presented in the literature. However, these sensors just give point wise information, are expensive to produce and have in most cases a limited durability.


The purpose of this project is to develop measurement techniques to measure the load distribution in refiner zones. The project is carried out at FSCN-MIUN under supervising by experienced researchers and in cooperation with a supervising group including representatives from the participating companies.


Until now a design of the sensor has been developed. In this design, special measures have been taken so as to secure the durability of the sensor i.e. to protect sensitive parts (strain gauges) from the hot steam. Also, how to manufacture the sensor and how to install it in the static refiner plate has been decided upon.


Detailed numerical calculations are being performed so as to optimize the sensitivity of the sensor while avoiding elastic instability and onset of plastic deformation. The purchase of signal amplifiers and data acquisition system is also an ongoing activity.

Researchers in the area

Professor and subproject leader
Per Gradin

Staffan Nyström (FSCN)
Jan-Erik Berg (FSCN)
Anders Karlström (CIT)
Olof Melander (Metso)
Bengt Åkerblom (Dametric)
Christer Sandberg (Holmen)
Bengt Wikman (SCA)