Study On The Application Of Nanofiber Membranes In The Capture And Filtration Of 3D Printing Particle Emissions

In this era of mass entrepreneurship and innovation,3D printers have entered the medical,family and other living situations with the continuous development of fused deposition modeling(FDM)3D printing technology.As everyone knows,the particle emissions during 3D printing are one of the sources of air pollution(PM2.5)and are severely threatening the health of human beings.However,there are few researches on 3D printing particle emissions at the moment.In this study,electrospinning technology was used to manufacture the nanofiber membranes.What is more,the formation process of fine particles and the filtration effect of nanofibers in 3D printing process was studied and discussed.1.This thesis manufactured the nanofiber membrane based on electrospinning technology,designed experiment method and set up experimental device,which verified the feasibility of polycaprolactone(PCL)nanofiber membrane for capturing the PM2.5 particles released by FDM 3D printing.The generation and aggregation of 3D printing emissions were studied in different test environments.The experimental results show that:(1)The PCL nanofiber membranes can effectively capture 3D printing particle emissions.(2)Relative humidity plays a signification role in the aggregation of the captured particles.(3)Generation and aggregation of particles from 3D printing can be divided into four stages:in the first stage,the PM2.5 concentration and particles size increase slowly;in the second stage,small particles are continuously generated and their concentration increases rapidly;in the third stage,small particles aggregate into more large particles and the growth of concentration slows down;in the fourth stage,the PM2.5 concentration and particle aggregation sizes increase rapidly.(4)The ultrafne particles denoted as "building unit" act as the fundamentals of the aggregated particles.2.The orthogonal experimental method was used to obtain the technological parameters with different diameter nanofibers in electrospinning.Then,the filtration effect of different diameter polyacrylonitrile(PAN)nanofiber membranes on different particle size particles was also studied.Finally,the optimal filtration effect of nanofiber membrane was applied to 3D printing process.The experimental results show that:(1)the diameter of nanofibers can be effectively controlled between 80 nm to 260 nm by adjusting the electrospinning parameters.(2)Finer PAN nanofiber membranes were beneficial to improve the filtration effect.(3)The filtration efficiency of finer PAN nanofiber membranes on fine particles was significantly improved.(4)The best filtration effect of PAN nanofiber membranes was applied to 3D printing process and the filtration efficiency is very obvious which can reach about 80%.The achievements in this study extends the application of nanofiber membrane in 3D printing and firstly put forward a feasible and effective research method for capturing and filtering 3D emissions.And the method can greatly reduce the impact of air pollution when using indoor 3D printers.At the same time,the research results will help to create a wide range of applications of nanofiber-based filters in 3D printing and other green or environmental-friendly causes.