screw barrels

What is a screw barrel?

A screw barrel refers to the combined system of a rotating screw housed inside a cylindrical barrel. This assembly performs material conveying, melting, mixing, and pressurization during continuous or cyclic processing. In actual production environments, the performance of a screw barrel depends on three factors: material selection for both screw and barrel, machining precision of flights and inner bore, and surface treatment methods applied. These factors together determine how uniformly material plasticizes, energy consumption, and how long the screw barrel remains in service before replacement.

Why screw barrel quality matters in processing lines

Processing conditions vary widely. Some materials are highly abrasive; others are corrosive or require high temperatures. A screw barrel that works well for general-purpose extrusion may fail prematurely when used with glass-filled composites or halogen-containing formulations. Below are common failure modes observed across extruders and injection molding machines.

Common failure modes of screw barrel assemblies

EJS product line: screw barrel types and configurations

EJS offers multiple screw barrel types to cover different equipment categories and processing methods. The table below summarizes compatibility and typical applications.

Screw barrel product categories by machine type

Most products are manufactured as OEM custom orders. The same screw barrel design supplied to a machinery brand may also be available directly to end-users.

Material options and specifications for screw barrel

Base material determines mechanical strength, wear resistance, and corrosion resistance of a screw barrel. EJS provides eight material grades, selected according to operating conditions and budget.

Available steel grades for screw and barrel

Surface treatment options for screw barrel

Technical parameters: screw barrel dimensions and tolerances

The following tables provide typical dimensional ranges for extruder and injection molding applications. Custom dimensions are available upon request.

Typical screw barrel specifications (extruder & injection molding)

Typical twin screw barrel parameters (conical and parallel)

Industries using EJS screw barrel solutions

Screw barrel assemblies manufactured by EJS are found in the following fields:

• PVC building materials and sheets
• Soft and hard pipes, profiles, tubing
• Wires and cables (insulation and sheathing)
• Rubber products (profiles, hoses, tire components)
• Silicone microporous tubes and medical tubing
• Plastic modification (single screw and twin screw)
• Film blowing, injection molding, blow molding
• Recycled plastics and reclaim systems
• Chemical, pharmaceutical, food, and agricultural processing

Comprehensive Range of Screw Barrels

As a professional Screw Barrel Supplier, EJS offers a complete product line:

Extruder Screw Barrel

Twin Screw Barrel (Parallel / Conical)

Injection Moulding Screw Barrel

Blown Moulding Screw Barrel

Rubber Screw Barrel

Bimetallic Screw Barrel

Hardfacing Screw & Barrel

Customized Extruder Parts (Die, Gearbox, Nozzle, etc.)

Most products are OEM customized, and you may be using them without knowing they come from EJS.