Department of Mechanical Engineering, Sejong University, Seoul 05006, Republic of Korea; Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea; Graduate School of Energy and Environment, Korea University, Seoul 02841, Republic of Korea.
Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea; Graduate School of Energy and Environment, Korea University, Seoul 02841, Republic of Korea.
J Environ Sci (China). 2021 May;103:148-156. doi: 10.1016/j.jes.2020.10.018. Epub 2020 Nov 16.
Indoor air quality (IAQ) directly affects the health of occupants. Household manufacturing equipment (HME) used for hobbies or educational purposes is a new and unexplored source of air pollution. In this study, we evaluated the characteristics of particulate and gaseous pollutants produced by a household laser processing equipment (HLPE). Various target materials were tested using a commercial HLPE under various operating conditions of laser power and sheath air flow rate. The mode diameters of the emitted particles gradually decreased as laser power increased, while the particle number concentration (PNC) and particle emission rate (PER) increased. In addition, as the sheath air flow rate quadrupled from 10 to 40 L/min, the mode diameter of the emitted particles decreased by nearly 25%, but the effect on the PNC was insignificant. When the laser induced the target materials at 53 mW, the mode diameters of particles were <150 nm, and PNCs were >2.0 × 10 particles/cm. Particularly, analyses of sampled aerosols indicated that harmful substances such as sulfur and barium were present in particles emitted from leather. The carcinogenic gaseous pollutants such as acrylonitrile, acetaldehyde, 1,3-butadiene, benzene, and C aromatics (ethylbenzene) were emitted from all target materials. In an actual indoor environment, the PNC of inhalable ultrafine particles (UFPs) was >5 × 10 particles/cm during 30 min of HLPE operation. Our results suggest that more meticulous control methods are needed, including the use of less harmful target materials along with filters or adsorbents that prevent emission of pollutants.
室内空气质量（IAQ）直接影响居住者的健康。用于爱好或教育目的的家用制造设备（HME）是一种新的、尚未开发的空气污染源。在这项研究中，我们评估了家用激光加工设备（HLPE）产生的颗粒物和气体污染物的特性。使用商业 HLPE 在不同的激光功率和鞘气流量的操作条件下测试了各种目标材料。随着激光功率的增加，发射粒子的模态直径逐渐减小，而粒子数浓度（PNC）和粒子发射率（PER）增加。此外，当鞘气流量从 10 增加到 40 L/min 时，发射粒子的模态直径减小了近 25%，但对 PNC 的影响不显著。当激光在 53 mW 下诱导目标材料时，粒子的模态直径<150nm，PNC>2.0×10 个粒子/cm。特别是，对采样气溶胶的分析表明，皮革中排放的粒子存在有害物质，如硫和钡。所有目标材料都排放出丙烯腈、乙醛、1,3-丁二烯、苯和芳烃（乙苯）等致癌气态污染物。在实际的室内环境中，在 HLPE 运行 30 分钟期间，可吸入超细颗粒物（UFPs）的 PNC>5×10 个粒子/cm。我们的结果表明，需要更细致的控制方法，包括使用危害较小的目标材料以及防止污染物排放的过滤器或吸附剂。
