Planetary screw extruder
Usually, the length-to-diameter ratio of this segment of the planet is 5:1. When the main screw rotates, the planetary screw drives. In fact, the planetary screw is floating. In order to prevent it from being removed along the slanting direction, there is a rotation stop at the die. ring. The material enters the extruder through a hopper through a forced feeding device. After entering the metering section, under the joint action of the main screw, the planetary screw and the inner wall of the barrel, the inner thread is crushed into a piece, because the screw thread has a helix angle of 45. The help is delivered forward.
Planetary screws have the following characteristics compared to conventional screws.
1. The flow channel has no dead angle and has a good self-cleaning effect, which is very beneficial for the processing of rigid polyvinyl chloride powder.
2. In the section, the central screw and the barrel can be heated. The heat of the material is mainly caused by heat exchange and heat conduction in a large area, rather than heat generated by shearing.
3. The total meshing frequency of all the intermeshing screws is very high, and the Zui height can reach 300,000 times/min. This effect is proportional to the number of revolutions of the screw, which greatly increases the number of kneading, squeezing, shearing and stirring of the material. .
4. In the case of the same extrusion amount, the residence time in the planetary screw extruder is short, generally 20-40s, and the ordinary single screw extruder under the same extrusion amount is 40-70s, twin-screw extrusion The exit is 30-60s.
5. The energy consumption per unit of extrusion (ie, specific energy consumption) is low. The processing of rigid polyvinyl chloride, planetary screw extruder is 288kj/kg, while the ordinary single screw is 612kj/kg, and the counter-rotating twin-screw extruder is 432kj/kg.
Planetary screw extruders are especially suitable for the processing of heat-sensitive materials (such as hard polyvinyl chloride), which can simultaneously satisfy the melt with good uniform mixing at the lowest possible temperature, and can provide low but Sufficient strength of shear, short residence time, high yield, low energy consumption, additives added, modifier dispersion, and other requirements. It is difficult to manufacture, and no manufacturer has been able to produce it yet.
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