Air permeability is one of the important properties which affect the performance of nonwovens used for filtration, insulation and drainage applications. In this study, an analysis on the air permeability of the polyester/viscose blended needle-punched nonwovens has been carried out. In addition, a mixture-process crossed regression model with two mixture components (polyester and viscose blend ratios) and two process variables (fabric mass per unit area and needling density) is developed to analyze the air permeability of polyester/viscose blended needled nonwovens. For this purpose, five different blend ratios of polyester/viscose webs were produced, cross lapped and needled in four different mass per unit areas and three different punching densities. Air permeability of sixty nonwovens was determined by performing standard test method and the data obtained from tests were statistically analyzed with the Design Expert software. In conclusion, blend ratio of polyester-viscose fibers in web, fabric mass per unit area and needling density have major effects on the air permeability of nonwovens and the generated statistical model has given satisfactory predictions about air permeability.

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The objective of this research is to study the thermal comfort of simulated multilayered diaper structures in dry and wet conditions. To that end, a back sheet, breathable films, a superabsorbent core, and top sheets were provided and diaper structures were generated. In order to reveal their possible effects on thermal comfort, five different types of breathable films and two different types of top sheet layers were selected. Relative water vapor permeability, water vapor resistance, thermal conductivity, thermal resistance, and thermal absorptivity characteristics were analyzed and the results were evaluated statistically using analysis of variance tests. The test results indicated that the breathable film type and the top sheet type used showed significant changes on the breathability and thermal comfort of the diaper structures in dry state. Nevertheless, no statistically significant effects were observed in wet state.