Test of pore size of SMS composite nonwovens and its effect on hydrostatic pressure and permeability
The bubble point method was used to study the microstructures of three kinds of polypropylene SMS composite nonwovens with different mass per unit area.The microscopic structure of the aperture is revealed and the effects of the pore size on hydrostatic pressure and air permeability is analyzed.Research shows that the average pore diameter of sample A(mass per unit area:25.1 g/m2)was 24.59,and that of sample B(mass per unit area:50.0 g/m2)and sample C(mass per unit area:54.4 g/m2)were about 15 μm.Sample A has the largest distribution range of pore size,followed by sample B and sample C.The difference is mainly caused by the bubble point diameter.The hydrostatic pressure is mainly determined by the bubble point diameter of the nonwovens.The larger the bubble point diamete is,the smaller the hydrostatic pressure is.The influencing factors of air permeability are complex and have no correlation with the average pore diameter.
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维普
