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The objective of this paper is to model the energy consumed in generating cellulose microfibres, 1 µm in diameter, as reinforcing agents, by refining bleached softwood kraft pulp in a PFI mill. An average initial fibre diameter of 13 µm was assumed. 125,000 revolutions in a PFI mill was found to produce a high yield of fibres 1.3 µm in diameter, and the minimum refining energy needed to reduce the fibre diameter to 1.3 µm was estimated as 1875 kJ for each 24 g charge in the PFI mill. Since elastic deformation of the fibres was found to be negligible, the size reduction was assumed to follow Rittinger's Law. This gave a Rittinger's constant of 28 J.m/kg for the given system. Using this value of Rittinger's constant, the energy required to generate microfibres 1 µm in diameter was predicted as 2480 kJ for each 24 g charge in the PFI mill. It was deduced that microfibres generated in this way would cost a minimum of $2.37 per kilogram. Hence even this relatively inefficient method of grinding would not be prohibitively expensive, provided the resulting microfibres can be used as high quality reinforcements.

Modeling energy consumption for the generation of microfibres from bleached kraft pulp fibres in a PFI mill