Investigation of single and multi-layer nonwovens thermal insulation and air permeability behaviors

Textile materials have potential importance for an alternative use on thermal insulation as their porous and fibrous structure. In this study, thermal insulation and air permeability of multi-layer nonwovens with 120, 180 and 500 g/m2 forming single and double layer were investigated. Moreover, thermal insulation and air permeability of triple-layer and four-layer nonwovens with the weight of 180 g/m2 were analyzed. It was found that the single layer nonwovens give better thermal insulation properties than the multi-layer nonwovens. Furthermore, the increase of weight of nonwovens causes to increase in thermal conductivity coefficients. According to the air permeability measurements, the results show that the air permeability of samples decreases with the increase of weight of samples and number of layer.