Abstract
Fiber size, pore size, and air permeability are three important properties in melt blown (MB) webs. Air permeability governs the air resistance or the pressure drop of the air through the web. One of the major applications of MB webs is for air filters. Fiber size dominates the web air filtration efficiency. Liquid filtration is another major application of MB webs. Pore size of the web determines the rated particle size in liquid filtration. Air permeability can be easily determined by air permeability testers. Fiber size and pore size in MB webs are difficult to measure by optical microscopy or other methods. However, they can be determined in fibrous products from the air flow rate through the web.
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