pps proceeding - Abstract Preview
pps proceeding
Symposium: S06 - Morphology and structural development
Poster Presentation
 
 

Orientation in LLDPE cast films manufactured under different processing parameters

Schöppner Volker (1), Bayazian Hoda (1)*, Yadegari Ali (2), Haddad Hoda (1)

(1) Paderborn University - NRW, Paderborn - Germany, (2) Persian Gulf University - Bushehr - Iran

Linear low density polyethylene (LLDPE) films under different processing conditions in terms of line speed, air gap and film thickness are manufactured using a cast film line. The influence of processing parameters on crystal orientation in the cast LLDPE films is evaluated by wide angle X-ray scattering (WAXD). Diffraction patterns reveal no preferred crystal orientation in the cast films. To evaluate the amorphous orientation, shrinkage measurements are carried out in the both machine direction (MD) and transverse direction (TD). It is found that higher line speeds lead to a higher MD shrinkage in the films, and some TD shrinkages are also noticed in the films prepared at high line speeds. However, no significant differences are observed in the shrinkage behavior of films as air gap and film thickness change. The shrinkage detected in the cast films of high line speeds is taken as a measure of chain orientation in the amorphous phase.