Extrusion Screw Barrel Overview
Plastic extrusion equipment is mainly consist of two parts, main extruder and auxiliary parts. Main extruder include screw barrel, heating elements, gearbox, motor and feeding system, in which screw barrels are the core plasticizing and conveying parts. The size of extruder screw barrels normally range from 20mm to 250mm depends on application field and extrusion output requirement. Rootier industry can offer bimetallic extruder screw barrels with much longer wear resistance performance
Different Extruder Screw Design
- General purpose single flighted screw:
For most regular use application, the single flighed screw is suitable for simple extrusion of virgin material without much reinforced additives. Full length flight can armored with bimetallic alloy, and easy to process also with fast delivery. It's designed still with polymer-tailored compression ratio, L/D, feeding depth & metering depth, to guarantee proper shearing of plastics
- Barrier type screw:
Barrier type extruder screw are designed to seprate un-melted polymer and second processing to lead to evenly melt polymers before delivery to die head. It's benefit with lower melt temperature and high output application where there is not enough L/D & time for homogenization.
- Mixer type screw:
For certain polymers processing and final product requirement, some screw cant mix resins quite well and need dispersive mixing to increase the production efficiency or to mix color more evenly. By that mixer screws are provided, mixer can have several types, like pineapple mixer, egan mixer, single mixer, which finally applied is according to difference situations also.
Popular rated Extruder Machines List
1. Coperion
2. Krauss Maffei
3. JSW
4. Useon
5. Jingming
6. Jwell
7. Beier
8. DXS
9. Battenfeld
10. Shibaru
11. Leistritz
12. Sumitomo
13. Davis Standard
14. Dakumar
15. Tongjia
