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The energy requirement at grinding can be affected by varying the grinding frequency and by varying the amplitude of deformation during the fibre releasing process. The grinding frequency can be studied by changing the peripheral speed of the pulpstone or by changing the grit distribution, i.e. the number of grits per square unit. The grinding amplitude can be studied by changing the size of the grits or by changing the feeding force. In this work the grit distribution, grit size, and two-sized grit mixtures have been studied. The material of the pulpstones manufactured for the trials was concrete reinforced with steel fibres and the grit material was aluminium oxide. The results show that the grinding process can be made more effi-cient, i.e. the specific energy / strength ratio can be decreased, by lowering the peripheral speed or by mixing grits of two sizes in the pulpstone.
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Available for Purchase – Conference Proceedings
TAPPI maintains a record of key conference papers, presentations, and other conference publications, available for purchase in a variety of formats.
Effects of Pulpstone Grits in Wood Grinding, 1991 Pulping Conference Proceedings
