Nonwoven Needle-Punched Materials with High Tensile Strength

The effect of the technology of roll calender processing of nonwoven needle-punched fabric based on a blend of polymer and bicomponent fibers on the correlation between the decrease of porosity and the tensile strength of the processed materials is investigated. The characteristics of fabric processing on roll calender are studied. A method is proposed for loading the calender, in which the time of contact of the fabric with the heated rollers increases. The porosity of the fabric decreases steadily with decrease of the gap between the rollers, whereupon the tensile strength of the material reaches the maximum at a particular gap between the rollers.