What is the difference between single screw and twin screw extruder?

When making a decision,customer may confused if they should buy a single screw or a twin screw for their project? here are some points help you to distinguish them.
1.The plasticizing ability of them are different: single screw is suitable for polymer plasticizing extrusion and granular material extrusion processing; Shear degradation of the polymer is minimal, but the material stays longer in the extruder. Twin screw have better mixing&plasticizing ability, with shorter residence time in extruder, and suitable for powder processing.
2.Twin screw extruder can handle high level of process flexibility and capability to handle multiple processes such as melting, mixing, cooking, venting, cooling, etc. But in case of single screw extruder the throughput and screw speed are dependent, and screw designs with multiple processing functions in series are restricted.
3.Twin screw extruder offers higher process productivity as compared to single screw extruder.
4.The price of twin screw extruder is relatively higher because of the complex nature of the machine while single screw extruder structure is simple and with lower price.

The application of twin screw extuder: Glass fiber reinforcement, fuel resistant granulation (such as nylon 6, nylon 66, polyester, polybutylene terephthalate, polypropylene, polycarbonate, etc.) , high filler granulation (such as filling 75% CaCO3 PE and PP) and thermal sensitive materials granulation, such as PVC and crosslinked polyethylene cable materials), concentrated masterbatch (such as filling 50% toner), antistatic masterbatch and alloy cable materials granulation (such as sheath and insulation material), cross-linked polyethylene pipe granulation (such as hot water crosslinking masterbatch), thermosetting plastic mixing extruder, such as phenolic resin, epoxy resin and powder coating) , hot melt adhesive and polyurethane reaction extrusion granulation (such as EVA hot melt adhesive and polyurethane), K resin and SBS devolatilization granulation, etc.

The application of single screw extuder:Suitable for PP-R pipe, PE gas pipe, PEX crosslinking pipe, aluminum-plastic composite pipe, ABS pipe, PVC pipe, HDPE silicon core pipe and various co-extruded composite pipe; Suitable for the extrusion of PVC, polyethylene terephthalate, polystyrene, polypropylene, polycarbonate and other profiles and plates, as well as wire, rod and other plastic extrusion; By adjusting the speed of the extruder and changing the structure of the extruder screw, it can be used to produce various plastic profiles, such as polyvinyl chloride and polyolefin.

Hartek is manufacturer,supplier&exporter of Lab single screw extruder, Lab twin screw extruder, Lab film blowing machine, Mni 3D printer filament extrusion line, Lab cast film extrusion machine, Lab two roll mill, Lab banbury mixer,Hot-melt extrusion line etc.

                                                                                              Single screw extruder

                                                                                                 Twin screw extruder