Designing the half-masks of filter respirators for workers of mining enterprises

¹ Dnipro University of Technology, Department of Labour Protection and Civil Safety, 19 Yavornytskoho, 49005 Dnipro, Ukraine
² Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Division of Mineral Resource Acquisition, 7 Wybickiego St., 31-261 Krakow, Poland

^* Corresponding author: golinkongu@gmail.com

Abstract

The purpose of paper is to develop an algorithm for designing the half-masks of air-purifying respirators and assessment of their safety factor of insulation. To create a 3D model of a head, two-parameter NIOSH tables (National Institute for Occupational Safety and Health) were used. The model drawings were made with the use of Solid works software package. Differential geometrical method based on applying the moving Frénet trihedral was used to design half-masks. Two designs of the respirator half-mask were developed based on the averaged length and width of face (Modification 1), and length of face and lips (Modification 2). As a result of modeling test, the area and perimeter of the mask contact line have been defined. The safety factor of half-mask insulation was calculated theoretically. It has been established that the safety factor of Modification 1 half-mask is 2.5 times higher.