Meshing type co-rotating double screw extruder
Source: | Author: Ding Xiaolin | Published: 2019-02-25 | 147 views
The flow of the material in the full-thread section of the twin-screw extrusion system rotating in the same direction, because the speed of the co-rotating twin-screw in the meshing position is opposite, one screw pulls the material into the meshing gap, and the other screw Pushing the material out of the gap, the result is that the material is transferred from one screw to the other, and the shape is changed in a meander shape. This speed change and the relative speed of the meshing area are very favorable for material mixing and homogenization due to The gap between the meshing zone is small, the speed of the thread and the groove is opposite, the shearing speed is high, and the self-cleaning effect is good, that is, any accumulated material adhering to the screw can be scraped off, so that the residence time of the material is short. . This god extruder is mainly used for mixing materials and granulation. However, since the material is subjected to a large shear force in the meshing section, it is not suitable for the production of PVC.
1) Material transfer of single screw extruder
In a single screw extruder, material transfer is towed. In the solid conveying section, friction is dragged, and in the melt conveying section, it is viscous drag. The friction properties of the solid material and the viscosity of the molten material determine the transport behavior. If some materials have poor friction properties, it is more difficult to feed the material into a single-screw extruder if the feeding problem is not solved. Therefore, the particulate material is suitable for feeding in a single screw extruder.
2) Material transfer of twin-screw extruder
In a twin-screw extruder, especially an intermeshing twin-screw extruder, the transfer of material is transferred to some extent by forward displacement, and the degree of forward displacement depends on the screwing edge of one screw and the other screw. The proximity of the groove. A forced feed is formed and the powdered material facilitates the extrusion of the feed.
Ningxia Dingsheng Sunshine Environmental Protection Technology Co., Ltd.
Design Director: Ding Xiaolin