Filament Attenuation and Drawing Systems
topic
Spunbond filament attenuation uses high-velocity air drawing through slot or tube quenching and drawing systems to reduce the extruded filament diameter from 300 to 600 micrometres at the spinneret to 10 to 30 micrometres in the deposited web, with drawing air velocity and temperature controlling the degree of polymer crystallinity developed during attenuation that determines filament tenacity and modulus in the final spunbond fabric.
Role
Reduces extruded filament diameter to the fine filament size required for spunbond fabric properties through pneumatic drawing that simultaneously orients and crystallises the polymer, with drawing air velocity being the primary process variable controlling final filament fineness and polymer orientation that together determine the mechanical properties and fabric quality of the spunbond nonwoven produced.