Frictional testing of wood: Initial studies with a new device

Frictional testing of wood : Initial studies with a new device

Svensson, Birgitta A. (författare): Mittuniversitetet,Institutionen för naturvetenskap, teknik och matematik (-2012),FSCN – Fibre Science and Communication Network

Nyström, Staffan K. (författare): Mittuniversitetet,Institutionen för naturvetenskap, teknik och matematik (-2012)

Gradin, Per A. (författare): Mittuniversitetet,Institutionen för naturvetenskap, teknik och matematik (-2012),FSCN – Fibre Science and Communication Network

Höglund, Hans (författare): Mittuniversitetet,Institutionen för naturvetenskap, teknik och matematik (-2012)

(creator_code:org_t)

Elsevier BV, 2009
2009
Engelska.
Ingår i: Tribology International. - : Elsevier BV. - 0301-679X .- 1879-2464. ; 42:1, s. 190-196

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Abstract Ämnesord

Stäng

In the chip refining process used for mechanical pulp production, wood fibers are treated in a flat and narrow gap between rotating plates. The process is very energy consuming and much of the electrical energy supplied to the refiner is transferred to the fiber material through friction forces. Even though friction has been discussed frequently over the years among pulp and paper researchers worldwide and held to be of great importance, little has been proven due to the complexity of the refining equipment and the extreme conditions prevailing during operation. This paper presents a new apparatus for studying the frictional properties of wood, in lab-scale, under chip refining conditions. Friction tests can be carried out in a steam atmosphere under high temperature/pressure with maximum sliding velocity as high as 150 m/s. Initial studies at room temperature showed that the coefficient of friction between spruce wood and smooth steel increased linearly with the moisture content of the wood specimens. Impregnation by wood extractives lowered the friction coefficient for dry wood surfaces sliding at high speed. When tests were performed in a saturated steam environment, pressurized to various degrees, the frictional properties were strongly affected and varied by the temperature of the surroundings � which always has been considered as constants in analytical and numerical models of process operation.

Av författaren/redakt...: Svensson, Birgit ...; Nyström, Staffan ...; Gradin, Per A.; Höglund, Hans

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