Characterization of wood dust emission from hand-held woodworking machines

ABSTRACT

This article focuses on the prevention of exposure to wood dust when operating electrical hand-held sawing and sanding machines. A laboratory methodology was developed to measure the dust concentration around machines during operating processes. The main objective was to characterize circular saws and sanders, with the aim of classifying the different power tools tested in terms of dust emission (high dust emitter vs. low dust emitter). A test set-up was developed and is described and a measurement methodology was determined for each of the two operations studied. The robustness of the experimental results is discussed and shows good tendencies. The impact of air-flow extraction rate was assessed and the pressure loss of the system for each machine established. For the circular saws, three machines over the nine tested could be classified in the low dust emitter group. Their mean concentration values measured are between 0.64 and 0.98 mg/m³ for the low dust emitter group and from 2.55 and 4.37 mg/m³ for the high dust emitter group. From concentration measurements, a machine classification is possible—one for sanding machines and one for sawing machines—and a ratio from 1–7 is obtained when comparing the results. This classification will be helpful when a choice of high performance power tools, in terms of dust emission, must be made by professionals.

Keywords:

• Aerosols
• air cleaning
• concentration measurement
• dust emission
• hand-held machines
• wood dust