A planetary roller extruder consists of planetary screws rolling on the main screws inside the rolling cylinder’s internal teeth. This rolling cylinder assembly rotates like planets with its screws mating at a 45-degree helix to extrude melted plastic with an optimal level of dispersion, gelling (gelation), plasticization and homogenization by rolling it about 1,100 times as it goes through the rolling cylinder. (Stable processing is enabled as the resin temperature that temporarily increases in section “B” drops through the heat exchange action with the resin at a lower temperature in section “A”.) When compared to other types of extruders, a planetary roller extruder can increase its contact surface area when processing the resin by about a factor of eight. It enables for dispersion, gelling and residence time adjustments and a low temperature extrusion by changing the inside diameter of the stop ring, retaining the planetary roller at the outlet of the extruder.
Compounding Cost Reduction
Due to the optimized heat transfer achieved through the increased contact surface area with the resins, it enables for compounding cost reduction by minimizing the use of additives including stabilizers, lubricants and other chemicals.
Since the planetary rollers operate as constantly intermeshing gears at a 45° helix to provide an excellent resin transfer efficiency, there will be no residue left in the barrel from the resin change-over. This self-cleaning function prevents the risk of possible resin degradation caused by local left-overs.
Achieves a uniform material property through low temperature processing
Enables for flexible adjustment of dispersion and gelling levels
Improved dispersion and mixing of the compounding materials
An effective removal of volatiles with a vacuum applied at the exit section
A superior discharge capacity
Minimized residence time
Soft PVC, Semi PVC, Ridge PVC
LDPE, HDPE, PP, ABS
Powder coatings, rubber, food
Extrusion Capacity (Kg/Hr)
Semi Ridge PVC
90Kw X 4P
110Kw X 4P
185Kw X 4P
240Kw X 4P
315Kw X 4P
Number of Planetary Screw
Compactor Driving Power
Allows for higher discharge capacity at low-speed rotation