Abstract
This paper discusses the development of a new purge compound, Plexar' PX 909, which was designed to remove residual polar resins, such as polyamides, ethylene/vinyl alcohol (EVOH), and oxidized polyolefins or color concentrates which adhere to the internal parts of an extruder and die. Several characterization techniques were used to compare the purging efficiency of PX 909 to that obtained with three commercial purge compounds and low density polyethylene (LDPE). Data showed that PX 909 was at least twice as efficient as other purging compounds in purging residual nylon or EVOH from extruders. The high purging efficiency of PX 909 is attributed to its ability to chemically react with residual polar compounds remaining in the extruder.
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