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screw barrel
EJS Screw Barrels are core components of plastic extruders and injection molding machines. They efficiently process various plastic raw materials, transforming granular resins into a uniform melt and delivering it to the mold or die under stable pressure and temperature. Whether producing high-precision parts, plastic films, pipes, or profiles, EJS Screw Barrels ensure consistent quality and output.
Core Functions
| Function | Description |
|---|---|
| Feeding | Plastic pellets are drawn from the hopper into the barrel, and the screw starts conveying. |
| Compression & Melting | As the screw rotates, pellets are compressed by decreasing channel depth. Shear heat and barrel heaters melt the plastic completely. |
| Mixing & Homogenizing | Screw flight design ensures thorough mixing, uniform temperature, viscosity, and color. |
| Metering & Pumping | The screw end meters precise melt volume and generates pressure to push the material to the nozzle or die. |
Construction Materials
| Component | Standard Material | Premium / Special Options | Key Advantages |
|---|---|---|---|
| Screw | Nitrided 4140 Steel | Powder Metallurgy Steel (PM), Hastelloy, Bimetallic, Tungsten Carbide Coating | High wear resistance, excellent toughness, corrosion resistance |
| Barrel | Nitrided 4140 Steel Liner | Bimetallic Liner (Xaloy, Borealis), Ceramic Lined, Dual Alloy | Superior inner surface hardness, wear and adhesion resistance |
Technical Specifications
| Parameter | Description | Standard Range / Options |
|---|---|---|
| Screw Diameter (D) | Outer diameter of the screw | 20mm – 300mm+ |
| Length-to-Diameter Ratio (L/D) | Determines plasticizing capacity and mixing quality | 20:1, 24:1, 28:1, 32:1, 36:1, Custom |
| Compression Ratio (CR) | Ratio of flight depth in feed zone to metering zone | 2:1 – 3.5:1 (general purpose), material-specific designs available |
| Screw Design Type | Geometry tailored to material processing | General Purpose (GP), Mixing (Barrier, Maddock), Vented (Two-Stage), PVC (Conical, Low Shear) |
| Surface Hardness | Hardness of screw flight and barrel inner surface | Screw: 60-70 HRC |
| Clearance | Radial gap between screw flight and barrel wall | Precisely machined to 0.1% – 0.15% of diameter |
| Heating & Cooling | Compatible with machine heating/cooling layout | Customized per customer machine |
How to choose the right Screw Barrel?
There is no one-size-fits-all answer to choosing the right screw and barrel combination. The following factors should be considered:
Main processing material: Each plastic (such as Nylon, PET, PVC, LDPE, HIPS) has different melt characteristics, requiring different shear sensitivity and corrosion resistance.
Production and quality targets: Consider production output (kg/hr), mixing uniformity, and energy efficiency.
Equipment parameters: Clamping force, screw drive capacity, and motor torque of the existing injection molding/extrusion machine.
Final product type: High-precision parts, films, sheets, pipes, and profiles have different requirements for melt uniformity and pressure stability.
The EJS engineering team can analyze materials, production requirements, and machine types based on customer needs to recommend the optimal screw design, materials, and surface hardening solutions, ensuring high productivity, stable quality, and long service life, even under high-load production conditions.
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Barrel and Screw
Barrel and screw manufacturer EJS has been producing barrel and screw since 1990 for customers nationally and internationally with customers in extrusion, injection and blow moulding machines in plastics, rubber and food industries for both end-users and OEMs.
The screw is the heart of the machine, the injection moulding machine and the extruder, because it determines its plasticizing ability.
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