Permeability properties of dry-laid mechanical bonded nonwovens for filter

The present study aimed to investigate the permeability of dry-laid, mechanically bonded nonwoven fabrics for filters of five different samples. Various permeability properties were investigated in the experimental part, such as water vapour permeability, air permeability, thermal conductivity, porosity parameters, and surface openness, which affect the permeability properties. The results of the study and statistical confirmation showed that the nonwoven structure has a great influence on filtration performance. It was found that the sample with the largest mass and thickness had the optimal filtration properties, as it had the smallest open area and thus the lowest water vapour permeability, average air permeability, and highest thermal conductivity. Statistical analysis confirmed that water vapour permeability correlates strongly with fibre diameter and bubble point, air permeability correlates strongly with thickness and mass, and thermal conductivity correlates strongly with fibre diameter, thickness, and mass of the nonwovens studied.