Two LLDPE-based purging masterbatches designed for LDPE, LLDPE, and HDPE blown and cast film and injection and blow molding are newly available from Ingenia Polymers Corp., Houston. Shutdown Purge Compound IP 1850 is formulated to reduce resin oxidation and protect equipment during shutdown and start-up. It is said to minimize crosslinking, gel formation, and carbonization. Purge Compound IP 1851 contains scrubbing and slip agents to facilitate rapid cleaning of processing equipment by efficiently removing degraded and carbonized polymers. Its major advantage in blown film applications is that that the bubble can be maintained during the purge cycle. It can also be used as a shutdown purge agent.
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