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Dust controls for a wood shaper.
Appl Ind Hyg 1987 Jul; 2(4):164-169
The ability of local exhaust ventilation to control dusts generated by a wood shaper was evaluated. Dusts generated by a wood shaper configured to make straight or nonstraight cuts with or without an exhaust duct or hood extension were measured while shaping white pine or red oak wood or particle board. Feed and spread angles were adjusted visually by the operator to achieve the best entrainment of dust into the exhaust flow. Exhaust flow rates were varied from 11.3 to 25.5 cubic meters per minute (m3/min). The optimum feed angles for white pine, red oak, and particle board were 18 to 75, 18 to 30, and 18 degrees (deg), respectively. The corresponding optimum spread angles were 30, 120, and 180deg. Overall, the shaper generated about eight times as many dust particles when processing red oak as when processing white pine and about ten times as many particles when shaping particle board as when shaping white pine. When configured to make straight cuts with the exhaust duct in place, the shaper generated similar concentrations of dust when processing white pine and red oak. The relative particle counts averaged 1.9 at 13.5m3/min and 1.3 to 1.4 at 24.8m3/min. When configured to make nonstraight cuts without the hood extension, the relative dust particle counts while shaping white pine, red oak, and particle board averaged 34.8, 216.0, 292.2, respectively, at 11.3m3/min. When the hood extension was in place, the relative particle counts were reduced to 11.4, 84.2, and 127.8, respectively. When shaping white pine, red oak, and particle board at an exhaust flow rate of 25.5m3/min without the hood extension, the relative dust particle counts were 16.2, 149.2, and 164.8m3/min. With the hood extension in place, the relative dust counts were only 1.1, 1.3, and 7.4, respectively. The author concludes that placing an exhaust duct or hood close to the shaper cutter is more effective for reducing dust emissions from wood shapers than increasing the exhaust flow rate.
NIOSH-Author; Wood-dusts; Dust-control; Woodworking-equipment; Exhaust-ventilation; Laboratory-testing; Industrial-hygiene; Dust-analysis
David James Huebener, U.S. Department of Health and Human Services, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, Ohio 45226
Issue of Publication
Applied Industrial Hygiene
Page last reviewed: November 6, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division