The polymer air-drawing model of polylactic acid (PLA) spunbonding nonwovens has been established. The influence of the density and the specific heat capacity of polymer melt at constant pressure changing with polymer temperature on the fiber diameter are studied. The predicted fiber diameter tallies well with the experimental data. The effects of the processing parameters on the final filament fiber diameter have been investigated. A lower polymer throughput rate, a higher polymer melt temperature, a higher polymer primary air temperature, and a higher polymer air suction speed can all produce finer fibers. Fiber diameters first decrease with increases in the venturi gap and then increase with increases in the venturi gap. The results also reveal the great potential for this research in the computer-assisted design (CAD) of spunbonding technology.
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