Polymer Extrusion and Melt Spinning in Spunbond
topic
Spunbond polymer extrusion uses single or twin-screw extruders melting polypropylene, polyester, or polyamide at 200 to 300 degrees Celsius and metering melt through distribution systems to spinnerets with 2000 to 10000 orifices per metre of machine width at orifice diameters of 0.3 to 0.6 millimetres, with melt viscosity, pressure uniformity across the spinneret, and filtration controlling filament diameter uniformity and defect frequency.
Role
Provides the polymer melt processing that converts resin pellets into extruded filament streams whose diameter and uniformity determine the final spunbond fabric properties, with spinneret design and melt distribution uniformity being the most critical machine elements governing the between-filament diameter consistency and absence of drips or filament breaks that would create web defects in the bonded spunbond fabric.