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1 2004

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Nowe kierunki w rozwoju maszyn mielacych

Tyralski T., Biel-Tyralska A.

Przegląd Papierniczy

2004

R. 60, nr 5

253-261

The article evaluates an influence of construction and parameters of refiners (conical, disc and the newest cylindrical refiners of Andritz AG) on the effectiveness of refining process. For this purpose the following criteria have been considered: hydraulic efficiency, homogeneity of refining represented by a number of refining impacts and capacity of a particular refiner for pulp dispersing, The last criterion determines the size and consistency of flocs or, what is the most needed, a complete dispersion of flocs. Authors analyze an impact of dispersion degree of fibre suspension (deflocculating) alongside the whole refining area on the size of space between bars and forces affecting fibres. It has been proved that with the complete dispersion of fibre suspension (flocks) in entire refining area, the intensity of refining (SEL) should be strictly adjusted to the fibre morphology which is significantly different for fibres of earlywood and latewood. This is possible with the use of fractionation prior to refining, e.g. with application of AM80-F hydrocyclones made by NOSS AB, that is the cross section fractionation. It has been also showed that with a certain intensity of refining, the hydraulic effectiveness of refining depends on the value of relation between idle running of refiner and cutting edge length. Analysis cover value changes of this relation as a function of the rotor velocity and its diameter in different hydrodynamic and rheological conditions. Calculations proved that construction and parameters of Andritz cylindrical refiners enable treatment of short-fibre hardwood pulp in dispersed form of pulp suspension in the entire area of refining.