Soft PVC extruder screw cylinders
Specification
Material
Screw Design:
Parameter
Screw diameter: Ø15-300MM L/D:15-45
Barrel diameter: Ø25-500MM Length:300-1000MM
38CrMoAlA(JIS SACM645)
42CrMo(AISI 4140)
9Cr18MoV,stainless steel,etc
The screw should be single flighted,constant pitch,with the pitch equal to the diameter and the
length equal to 24 diameters.It should be bored for cooling.Screw Flights should be flamehardened.
The screw should be AISI4140 chrome plated.Since flexible PVC compounds can cover a wide range of
hardnesses,the screw design and dimensions are less critial than for rigid pvc.
Mixing pins and other types of mixing sections are often incorporated in a screw design to enhance dispersion,espeically when adding concentrates to a naturalbased compound.Screws with mixing
pins typically have 12-14 flights in the metering section.
Barrier screws are still another type of design that can be used for extruding flexible PVC.
Hard Chrome Plating treatment:
Thickness of Hard Chrome Plating Layer: 0.03-0.08mm
Hardness of Hard Chrome Plating Layer: ≥950HV
| Grade | Material | Process |
| Standard grade | 38CrMoAlA | Nitriding 96 hours |
| Bimetallic grade | 38CrMoAlA | HP/HVOF |
| TC-A grade | Tungsten carbide 40% | Centrifugal casting |
| TC-B grade | Tungsten carbide 25% | Centrifugal casting |
| TC-C grade | Tungsten carbide 10% | Centrifugal casting |
Our screw barrel are made by using advanced technology and equipment which provide various mechanical features such as strong ability, durability, exact fitting, etc. Our aim is focusing on customers requirement and create high quality products and technology.
