Abstract
The effects of (1) pelletizing extrusion conditions and (2) blowing film extrusion conditions on the physical properties of linear low density polyethylene (LLDPE) films were studied. The results show that better film properties can be obtained when a resin is pelletized at a lower temperature profile and then blown at a higher temperature profile.
As the melt temperature of the blown film extrusion increases, the optical properties of the LLDPE film are improved. The mechanical properties, however, remain essentially the same as those blown at lower temperatures. Extrusion conditions during pelletizing were shown to have a significant effect on the number of "gel" defects in film-with an increase in the melt temperature resulting in more gel.
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