Process for removing moisture and volatiles from pellets in single screw extruders

Rear venting has been used in single screw extruder

, but only in cases where the feed material is already molten. Such is the case when a compounding extruder is fed into a devolatilization extruder or when the feed is a polymer-solvent solution. For many applications, the volatile involved does not degrade the polymer so early extraction is not needed. Also, the volatile is typically distributed evenly throughout the pellet, thus feeding a polymer melt versus cold pellets would result in only a minor change of devolatilization efficiency.

Process for removing moisture and volatiles from pellets in single screw extruders

By: ericfu

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