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Planetary extruder is a single screw extruder with a multi-screw extruder combination of its feed section is equivalent to a single-screw extruder feed zone. The extruder is the most important part of the planetary kneading segments, mainly from the polymer melt kneading the role. The segment consists of a main screw, the certain root planetary screw and the wall of the create helical barrel configuration, the gap between the underside of the teeth of the planetary screw and barrel is 0.2 ~ 0.4mm, the diameter of the root of the number of the planetary screw planetary into proportional to ships having 6 to 18 root.