Blends of low density polyethylene (LDPE) and polyamide-6 (PA6) are produced via
blown film extrusion to study the effect of freeze-line position and stretching
force on blend morphology. An experimental setup is designed to measure the
stretching force as a function of draw ratio (DR) and freeze-line position for 4, 6,
and 10 wt% PA6 in LDPE. Numerical simulations of the non-isothermal and viscoelastic
process are in good agreement with the experimental data of film dimensions.
However, as reported many times in the literature, the calculated stretching force
is underestimated and can be predicted more precisely by using a simple correction
factor. The results also show that the dispersed phase deformation increases with DR
and decreases with freeze-line height.
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