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Description: Hemp fibre is a renewable resource that has the market potential for producing new fibrebasedproducts as well as replacing existing ones. Decortication onstitutes a key step in the production of high-quality hempfibres. A hemp decortication experiment was conducted using a. lab-scale planetary ball mill. Varying treatments, including three grinding durations (2, 4, and 6min) and seven grinding speeds(100, 150, 200, 250, 300, 350, and 400 rpm) were studied using retted hemp feedstock. Under these treatments, fibre yield, coreyield, and amount of chaff were determined following decortication. The detaching efficiency (defined as the reduction in theamount of fibre-bound-to-core), along with the performance index, were also determined to evaluate the overall performanceof the ball mill for hemp decortication. Results showed that grinding duration and speed impacted all the measuredvariables. The lowest grinding speeds, 100 rpm, resulted in a poor detaching efficiency (52.6%). The highest grinding speed,400 rpm, allowed for a greater detaching efficiency (99.7%), but reduced fibre yields (0% yield for 6min grinding duration)and increased chaff production (up to 100% chaff). Given all these facts, the best performance of the mill was found at 200 and250 rpm grinding speeds, regardless of grinding duration, interms of fibre yield and detaching efficiency.

Keywords: hemp, decortication, ball mill, fibre, core, yield, grinding, speed, duration.
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Citation: Baker, M.L., Y. Chen, C. Lague¨ , H. Landry, Q. Peng, W. Zhong, and J. Wang. 2010. Hemp fibre decortications using a planetaryball mill. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada. 52: 2.7-2.15.
Volume: 52
Issue: 2
Pages -
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Date: 2011-02-11
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Coverage: Canada
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