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zone): this zone feeds the resin into the extruder, and the channel depth is usually the same throughout the zone.
* Melting zone (also called the transition or compression zone): most of the polymer is melted in this section, and the channel depth gets progressively smaller.
* Metering zone (also called the melt conveying zone): this zone melts the last particles and mixes to a uniform temperature and composition. Like the feed zone, the channel depth is constant throughout this zone.In addition, a vented (two-stage) screw has:
*

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