Planetary Screw & Barrel for extruder machines Specification: Diameter: Ø15-Ø500 L/D ratio:5:1 We can manufacture all types of screws and barrels according to clients' requirement.
Base Materials: | 1)38CrMoAlA(JIS SACM 645) 2)42CrMo(AISI 4140) |
Bimetallic Alloy Materials: | 1)Fe-based alloy 2)Ni-based alloy 3)Co-based alloy 4)Tungsten carbide |
Processing Technology: | Heat treatment Nitriding treatment |
Technical Parameter: | Nitrided layer depth:0.50-0.80mm Nitrided hardness: 900-1100HV Nitrided brittleness: Less than 2 level Surface roughness: Ra 0.4 Linearity of screw: 0.015mm |
Planetary screw extruder The extrusion system can be separate for two sections. First section is normal screw (screw diameter equalto barrel inter diameter), and second section is planetary screw which general contains 7~18 pcs small screws and a main screw in the centre, the number of small screws depend on the screw diameter and application. These small screws is intermeshing with main screw and interior screw in the barrel inner wall. The characteristics of planetary compared with normal screw: 1.No deadangle in the flow channel, have good self-cleaning performance. It’s better for processing Rigid PVC. 2.As there are many small screws, the screw intermeshing frequency is higher, this function is proportional to the screw rotate speed, so it can largely increase the times of kneading, extrusion, cutting and mixing. 3.Basis on the same extrusion output, the materials is shorter stay in the planetary screw extruder. 4.Energy saving. The planetary screw barrel is mainly used for heat sensitive materials, such as processing rigid PVC. In the calender production line of PVC transparent chip, adopt planetary screw barrel to plastify and mixing raw materials for calender. It can make all melting materials, accessory ingredient and modifier uniformly mixing and dispersing.
