How much do you know about the differences and characteristics of single and twin-screw extruders?

The difference between single and twin screw extruders

Let's find out exactly what is the difference between these two types of extruders in terms of price, operability, screw, etc.

(1) Single-screw extruder is less expensive

Single-screw extruder with simple structure and low price.

Twin-screw structure is complex and the price is high. Twin-screw extruder is probably more expensive than a single-screw extruder to about 1 times. Individuals will be higher, depending on the manufacturer, model and different.

(2) single-screw formula is simple

For the operation, in fact, the difference between the two is not very large. But the single-screw extruder process, the formula is simpler, while the twin-screw extruder process, the formula will be more complex.

(3) Twin-screw can freely combine the screw

Twin-screw threads can be freely combined according to the material situation and the mood of the operator. Single screw is more rigid, can not combine the screw.

(4) Twin-screw higher efficiency

Twin-screw extruder output, extrusion speed, low energy consumption per unit of output, while the single screw is worse. The efficiency of twin-screw extruder is mostly about 1 times that of the single-screw extruder. Depending on the manufacturer, the model depends.

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(5) twin-screw mixing and plasticizing ability

Simply put, the single screw is suitable for polymer plasticizing extrusion, suitable for extrusion processing of granular materials, such as: molding, blown film, injection molding, etc., using a wide range of materials.

Twin-screw extruder has good mixing and plasticizing ability, which is more suitable for plastic modification. And twin-screw extruder can make two colors.

(6) Single screw is easy to maintain

In terms of maintenance, single screw will be more simple than twin-screw, because the structure of the single screw is simpler and easier to repair.

(7) Conveyor theory

Single-screw extruder conveying mainly relies on the friction between the material and the barrel. The heterogeneous twin-screw extruder is forward conveying and has the role of forcing the material forward, and the heterogeneous twin-screw extruder also produces shearing effect on the material at the engagement of the two screws. (for counter parallel?twin-screw extruder)

(8) speed

While the velocity distribution in a single-screw extruder is relatively well defined and easy to describe, the situation in a heterogeneous twin-screw extruder is quite complex and difficult to describe. This is mainly due to the fact that the screw has an engagement zone, and the complex flow that occurs in the engagement zone gives it many advantages such as adequate mixing, uniform heat transfer, high melt capacity, and good exhaust performance, but it is difficult to accurately analyze the flow state in the engagement zone. (For counter parallel?twin-screw extruder)?

(9) Application examples

Twin-screw extruder application examples: glass fiber reinforced, fuel barrier granulation (such as PA6, PA66, PET, PBT, PP, PC reinforced flame retardant, etc.), high filler granulation (such as PE, PP filled with 75% CaCO3), heat-sensitive materials granulation (such as PVC, XLPE cable material), concentrated color masterbatch (such as filled with 50% color powder), anti-static masterbatch, alloy, coloring, low filler Co-blending granulation, cable material granulation (such as sheathing material, insulation material), XLPE pipe material granulation (such as masterbatch for hot water cross-linking), thermosetting plastic mixing extrusion (such as phenolic resin, epoxy resin, powder coating), hot melt adhesive, PU reaction extrusion granulation (such as EVA hot melt adhesive, polyurethane), K resin, SBS de-volatile granulation, etc.

Single-screw extruder application examples: applicable to PP-R pipe, PE gas pipe, PEX cross-linked pipe, aluminum-plastic composite pipe, ABS pipe, PVC pipe, HDPE silicon core pipe and various co-extruded composite pipe; applicable to PVC, PET, PS, PP, PC and other profiles and plate extrusion, extrusion of various other plastics such as silk, rod, etc.; adjust the extruder speed and change the structure of the extrusion screw can be applied to The extruder speed can be adjusted and the structure of the extrusion screw can be changed to produce various plastic profiles such as PVC and polyolefin.

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