Manufacturing Non-woven Media with Cellulose Fiber, Carbon Fiber, and Polypropylene Fiber Used in HEPA Filters
HEPA filters are used to clean the air of particular contaminants. The most important component of these filters is their media, which is usually made of non-woven fabrics of natural and synthetic fibers. In this research, 3 types of fibers have been used to make these media: cellulose, Poly Propylene (PP), and carbon fiber (CF). In manufacturing these membranes, some parameters such as the fiber type, fiber length, additive polymer percentage, pressing temperature, and pressing pressure have been varied. The microstructure of pores has been characterized by Scanning Electron Microscopy (SEM), and pores sizes and pore distribution have been calculated by a Bubble-point hand-made-up apparatus based on ASTM F316. The arrestance efficiency of membranes has been determined by an aerosol analysis. Image J software has been used to validate the pore size and pore distribution data achieved by other analyses. The tearing test is performed to investigate the mechanical properties of membranes. It was observed that the cellulose membrane, in comparison to other membranes, has been achieved the highest tearing strength (4631 N/m) and the best arrestance efficiency (100%) for arresting the particles upper than 5 μm.
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