Extruder Twin Parallel Screw Barrel

Cooperating with an experienced Chinese manufacturer of Extruder Twin Parallel Screw Barrel, technical teams can freely customize shear sections to realize complex polymer modification. HAPPY PLASTICS adopts multi-axis CNC thread grinding, deep hole honing and high-grade centrifugal bimetallic casting to manufacture durable twin screw barrel systems. The equipment stably processes 30%–50% glass fiber reinforced materials, high mineral filler formulas and high-intensity devolatilization without melt pressure loss or screw shaft bending deformation.

Working Principle of Parallel Twin Screw Barrel

Extruder Twin Parallel Screw Barrel functions as a positive displacement melt conveying and high-shear mixing unit. Different from conical twin screw equipment, the screw outer diameter remains consistent from feeding port to extrusion die, keeping the cross-sectional flow volume uniform along the whole machine length.

When the two screws rotate in the same direction, materials circulate between the two screw flights in an infinity-shaped flow path. Ultra-tight flight-to-flight and flight-to-barrel matching clearance forms local high-shear zones to crush polymer aggregates. Continuous meshing movement achieves automatic self-cleaning, effectively avoiding material retention and thermal carbonization.

5-Zone Modular Combined Structure

HAPPY PLASTICS adopts full modular design for Extruder Twin Parallel Screw Barrel, instead of integrated non-adjustable structures. Technicians can freely combine and rearrange functional sections on spline shafts and segmented barrels to meet precise rheological processing requirements:

• Section 1: Main Feeding & Vent Block

Wide open non-jacketed barrel segment, large volume feed channel, suitable for pellet raw materials, fluffy powder and recycled plastic flake feeding.

• Section 2: Solid Conveying & Melting Block

Deep-groove forward conveying elements matched with dense 45°/60° kneading blocks, converting motor torque into uniform heat to realize rapid and full melting of solid plastics.

• Section 3: Side / Top Auxiliary Feeding Block

Reserved side/top feeding ports, which can inject liquid additives or hard glass fiber into fully molten melt, reducing direct abrasion to screw surfaces.

• Section 4: Intensive Mixing & Vacuum Devolatilization Block

Forward and reverse alternating screw elements form stable material sealing, build high shear pressure before the large vacuum vent section to fully discharge internal moisture and volatile small molecules.

• Section 5: High-Pressure Metering Discharge Block

Small pitch shallow flight elements stabilize melt flow, generate 4.0–8.0 MPa stable head pressure, and evenly push modified melt through underwater/strand pelletizing die.

Material Alloy Matching Table

Processing engineering plastics, biodegradable materials and color masterbatches will bring strong mechanical abrasion and acidic corrosion to screw and barrel. We match the most suitable alloy material for your production formula for Extruder Twin Parallel Screw Barrel:

Global Spline Standard Specifications

HAPPY PLASTICS’s Extruder Twin Parallel Screw Barrel can be directly installed and upgraded on existing compounding production lines. All mechanical structures fully comply with mainstream international connection standards to ensure interchangeability:

• Standard center distance precision: Strictly follow European and Asian mainstream extruder center distance parameters to retain the original equipment compression ratio without changing process parameters.

• Standard involute spline: Spline tooth profile manufactured in accordance with DIN 5480, ISO 4156, ANSI international standards, tight fit without idle clearance and torque backlash during rotation.

• Precision fitting surface: Each barrel segment’s joint surface is mirror ground, equipped with high-temperature metal sealing rings to prevent melt leakage under high internal pressure.

Technical FAQ

Q: The screw flights at the side glass fiber feeding port wear extremely fast, what is the cause?

A: When glass fiber is added into the barrel, it is not completely wrapped by molten plastic. Hard dry glass fiber continuously scours the screw surface like abrasive sandpaper. To solve this problem, the screw elements at the downstream of the side feeder of the Extruder Twin Parallel Screw Barrel must adopt HIP powder metallurgy high vanadium carbide alloy, matched with ultra-hard tungsten carbide barrel lining for double protection.

Q: Our production line needs to switch from color masterbatch compounding to biodegradable plastic granulation, can we reuse the original barrel equipment?

A: Yes. Our full-modular Extruder Twin Parallel Screw Barrel system does not require a complete set of new extruder investment. You only need to adjust the arrangement order of existing barrel sections (replace closed sections with vented sections) and replace the combination of screw elements on the spline shaft to adjust the shear strength, greatly saving equipment renovation costs.

Q: How does your parallel twin screw barrel realize precise independent temperature control during exothermic reaction modification?

A: Each modular barrel block is independently equipped with built-in parallel cooling water channels, matched with external high-efficiency ceramic heating rings. The dual heating and cooling control system cooperates with the production PLC to rapidly switch heating/cooling, keeping the processing temperature fluctuation within ±1℃ even in strong exothermic reaction working conditions.

Structural Quality Warranty

To guarantee that the delivered screw and barrel are straight, rust-free and can be put into production immediately after arrival, HAPPY PLASTICS implements strict international export packaging specifications:

• Heavy-Duty Export Anti-Corrosion Packaging Specification: All barrel sections and spline screw shafts are fully coated with wax-based industrial anti-rust grease, vacuum wrapped with VCI vapor anti-rust film, and fixed in IPPC fumigation seaworthy reinforced wooden cases filled with shock-absorbing foam to avoid collision deformation.

• 12-month structural quality warranty: All complete sets of Extruder Twin Parallel Screw Barrel enjoy a 12-month full structural warranty. Free replacement for material defects, alloy cracking and abnormal delamination under standard specified operating conditions.

• Complete traceable quality certification documents: Each order is attached with full inspection materials, including barrel inner diameter laser test record, material metallurgy certificate and screw element assembly layout drawing.