A novel method for designing and fabricating low-cost facepiece prototypes.
Joe PS; Shum PC; Brown DW; Lungu CT
J Occup Environ Hyg 2014 Oct; 11(10):665-671
In 2010, NIOSH published new digital headform models based on their recently updated fit test panel. The new panel, based on the 2000 census to better represent the modern workforce, created 2 additional sizes: Short/Wide and Long/Narrow. While collecting the anthropometric data that comprised the panel, additional three-dimensional data was collected on a subset of the subjects. Within each sizing category, five individuals' three-dimensional data were used to create the new headform models. While NIOSH has recommended a switch to a five size system for designing respirators, little has been done in assessing the potential benefits of this change. With commercially available elastomeric facepieces available in only 3 or 4 size systems, it was necessary to develop the facepieces to enable testing. This study aims to develop a method for designing and fabricating elastomeric facepieces tailored to the new headform designs for use in fit testing studies. This novel method used computed tomography of a solid silicone facepiece and a number of computer aided design programs (VolView, ParaView, MEGG3D and RapidForm XOR) to develop a facepiece model to accommodate the Short/Wide headform. The generated model was given a physical form by means of three-dimensional printing using stereolithography (SLA). The printed model was then used to create a silicone mold from which elastomeric prototypes can be cast. The prototype facepieces were cast in 2 types of silicone for use in future fit testing.
Respirators; Respiratory-equipment; Personal-protective-equipment; Air-purifying-respirators; Anthropometry; Face-masks; Laboratory-testing; Testing-equipment; Equipment-design; Equipment-reliability; Performance-capability
Claudiu T. Lungu, Department of Environmental Health Sciences, University of Alabama at Birmingham, AL
Journal of Occupational and Environmental Hygiene
University of Alabama at Birmingham