Materials used as cigarette papers, filter plug wrap and filter joining paper, including materials having an oriented permeable zone. determination of air permeability.
作卷烟纸用的材料，过滤纸和过滤嘴接缝纸材料，包括定向可透气部分用的材料。透气性的测定。
The factors that influence core flow efficiency are flow permeability decrease in crushed zone and the thickness of crushed zone.
流动效率影响因素依次为：压实带中渗透率下降程度、压实带厚度。
The flow depends on following: permeability decrease in crushed zone, the shapes of perforating tunnel, the thickness of crushed zone.
流量影响因素依次为：压实带内渗透率下降程度、射孔孔道形状、压实带厚度；
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