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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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Plastic Panel Extruder Twin Screw Barrel
Plastic panels are largely used in our daily life everywhere, EJS can’t fall behind in this big job. Each year, thousands of Plastic panel extruder twin screw barrels are made at our workshops since 1992.
Injection Molding Feed Screws
An injection molding machine, also known as an injection press, is a machine for manufacturing plastic products by the injection molding process. It consists of two main parts, an injection unit and a clamping unit. EJS makes injection molding feed screws and barrels for injection unit of injection moulding machine, as well as tie bars and tie rods. We produce customized injection molding feed screws for JSW, BOY, ARBURG injection molding machines as per drawing provided.
Injection Blow Moulding Screw Barrel
For dozens of year, EJS produces injection blow moulding screw barrel for injection blow mould machine. Injection blow molding is the process whereby the plastic preform is injection molded and the preform travels on the core rod to the blow mold station, where blow air enters through the core rod and lifts the hot preform material off the core rod and forms it by air pressure to the design of the female blow mold.
Bimetallic Barrels
Bimetallic barrels supplier EJS INDUSTRY has been producing bimetallic barrels for over a dozen of years to extend the barrels life as well as to reduce the cost and machine down time.
Bimetallic barrel is like a tube and completely filled with a powered metal. There are different types of bimetallic barrels available which are used for various purposes such as extrusion, injection molding and blow molding machinery. The usage of bimetallic barrel provides a protective wear surface to improve the wear life.
Extruder Barrels
EJS INDUSTRY is a professional manufacturer of extruder barrels and is the number one exporter of extruder barrels in all these years in our area.
Extruder Parts
EJS is an expert manufacturer of extruder parts, including extruder screw, extruder barrel, rolls, dies, heaters, fans, gear box.
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