Evaluation of a model for predicting the air-permeability of needle-punch and calendered material
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The proposed model has limited use for evaluating the effect of the needle-punching and calendering regimes on the air-permeability of the material. It is somewhat difficult to correct the model to consider the effect of changes in thickness during needle-punching and calendering. The limited use of the model is due to the use of the filling factor and thickness of the material as the structural parameter.