Abstract
In order to improve filtration efficiency and precision of the filter media, two methods of surface refining treatment were presented, which were the co-stretching PTFE micro-porous membrane and foam coating on nonwoven filter media. During the process of co-stretching, the pore diameters and thickness of the membrane were different on the surface. The double-layer PTFE base sheet was simultaneously stretched, which induced the reduction of pore sizes and uniform thickness of the filter media. After foam coating, the pore sizes of nonwoven filter media were reduced to under 10 μm because of the micro-pore membrane formed on the surface. Therefore, filtration efficiency and precision were remarkably increased.
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