Rheology studies of two-phase gas-polymer suspensions during mold filling

In thermoplastic foaming, phase separation (i.e., bubble nucleation and growth) occurs due to a sudden change in pressure during mold filling that has significant effects on the rheology of polymer flow. An instrumented mold cavity has been designed to capture Theological measurements of the eventual two-phase gas-polymer suspensions. Experimental results for low density polyethylene (LDPE) and thermoplastic polyolefin (TPO) with two types of …