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Polyformaldehyde (POM)/ethylene-vinyl acetate copolymer (EVA)/high-density polyethylene (HDPE) composites filled with nanometer calcium carbonate (nano-CaCO 3 ) were prepared using a twin-screw extruder. The effects of load and temperature on the melt extrudate swell behavior of the composites were investigated, by using a melt flow rate instrument under experimental conditions, with temperatures ranging from 170°C to 220°C and loads varying from 1.2 kg to 12.5 kg. The results showed that the melt die-swell ratio ( B ) of the composites decreased linearly with a rise of temperature as the load was fixed, while it increased nonlinearly with increase in the melt volume flow rate ( MVR ) and load, when the test temperature was constant; they also showed that  B  is a quadratic function of shear rate or shear stress. The value of  B  increased nonlinearly with an increase of the HDPE weight fraction ( ϕ ) as the temperature was constant, and the temperature sensitivity of  B  to  ϕ  was insignificant, while the effect of load was significant. The correlation between  B  and  ϕ  obeyed a quadratic equation.

Melt extrudate swell behavior of POM/EVA/HDPE/nano-CaCO 3 composites