SIMULATION OF NATURAL FIBRE CLEANING IN A COMB SHAKER BY MEANS OF A GEOMETRIC-STATISTICAL MODEL

R. Pecenka, C. Fürll
There is an increasing demand for high-grade hemp and flax fibres as a raw material e.g. for the production of natural fibre reinforced composites. Modern processing facilities are needed for European farmers to supply competitive fibre materials. For reliable and economic plant operation at mass flow levels higher than 2.5 t/h hemp straw the capacity of the cleaning lines has to be increased. Comb shakers proved to have the highest potential to fulfill the requirements of modern short fibre cleaning. The input material is a fibre-hurd mixture produced by décorticating the hemp stalks in previous process stages into fibres and hurds. Based on comprehensive experimental investigations a new model has been developed to predict the throughput and cleaning results for hemp processing with comb shakers. The investigation of the screening process of fibre-hurd mixtures with hurd contents of more than 50 mass-% has brought out general different to typical screening processes known from agri¬culture and mineral processing. Therefore, a new 3-D screening model has been developed. The layers of hemp fibres are considered as horizontal and vertical screen surfaces with gamma-distributed apertures sizes. In dependence to the material flow caused by the shaker combs, hurds of different sizes are interacting with the screen apertures. Based on the developed geometric-statistical model for the screening process general design and process parameters for comb shakers can be investigated. By means of simulation calculations the number of test runs necessary for tailor made systems for reliable processing of high mass flows of hemp can be reduced to a minimum.
Pecenka, R. and Fürll, C. (2008). SIMULATION OF NATURAL FIBRE CLEANING IN A COMB SHAKER BY MEANS OF A GEOMETRIC-STATISTICAL MODEL. Acta Hortic. 802, 205-212
DOI: 10.17660/ActaHortic.2008.802.25
https://doi.org/10.17660/ActaHortic.2008.802.25
hemp, fibre processing, fibre cleaning, comb shaker, screening, modelling
English

Acta Horticulturae