This paper discusses the extrudate swell behavior of glass-filled poly
amide 6. The key features of the experiments were the facility to extr
ude directly into a density matched oil kept at extrusion temperature
and thus, the ability to measure the diameter of the extrudate of the
glass-filled polyamide immediately upon exit from the die, without the
extrudate contacting air and as a function of time in a chamber under
isothermal and neutrally-buoyant conditions. The concentration and or
ientation of the fibers of the extrudates were also studied using X-ra
y radiography in a post-mortem fashion. A skin/core morphology, where
uniaxially aligned fibers constitute the skin zone and the core contai
ns a reduced concentration of fibers, was observed.