INDUSTRY COMPONENT

Flight

A polymer extrusion screw is a rotating helical component that conveys, melts, compresses, and homogenizes polymer materials in extrusion machinery.

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Component Specifications

Definition
The polymer extrusion screw is a critical component in single or twin-screw extruders, designed with specific geometric features (length-to-diameter ratio, channel depth, pitch, flight width) to progressively transport solid polymer pellets or powder through feeding, compression, melting, and metering zones. It applies shear and thermal energy to plasticize the material, ensuring uniform melt temperature, pressure, and viscosity before discharge through a die.
Working Principle
The screw rotates within a heated barrel, using its helical flights to mechanically convey polymer feedstock forward. As the material moves, it undergoes compression, which increases pressure and frictional heat. External barrel heaters and internal shear heating melt the polymer. The metering section at the screw tip stabilizes melt flow and pressure for consistent extrusion.
Materials
Typically made from nitrided steel (e.g., 4140, 4340), tool steels (H13), or stainless steels (17-4PH, 316L). Coatings like chromium plating, nickel alloys, or tungsten carbide are applied for wear and corrosion resistance in abrasive or corrosive polymer processing.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Diameter (D)20-300 mm
Flight Pitch0.8D to 1.5D
Channel DepthVaries by zone (e.g., 10 mm feed, 3 mm meter)
Rotation Speed50-500 RPM
Compression Ratio2:1 to 4:1
Max Operating Temperature300-400°C
Length To Diameter Ratio (L/D)20:1 to 40:1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 13445, DIN 16780

Parent Products

This component is used in the following industrial products

Polymer Extrusion Screw

Rotating helical component for plasticizing and conveying polymer melts in extrusion systems.

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Extrusion Screw

A rotating helical shaft that conveys, compresses, melts, and homogenizes food materials within an extrusion barrel.

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Compression/Transition Section

The section of an extrusion screw where material is compressed and transitions from solid to molten state.

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Engineering Analysis

Risks & Mitigation
  • Wear from abrasive fillers
  • Corrosion from halogenated polymers
  • Thermal degradation from overheating
  • Mechanical failure from high torque
FMEA Triads
Trigger: Abrasive polymer additives (e.g., glass fibers, minerals)
Failure: Flight wear reduces conveying efficiency and melt homogeneity
Mitigation: Use hardened coatings (tungsten carbide), regular inspection, and material pre-blending
Trigger: Excessive shear heat or barrel temperature
Failure: Polymer degradation, causing discoloration or weak output
Mitigation: Optimize screw speed, temperature profiles, and use thermal stabilizers in polymer

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Diameter tolerance ±0.05 mm, straightness within 0.1 mm/m
Test Method
Dimensional inspection per ISO 13445, hardness testing (HRC 50-60), non-destructive testing for cracks

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Flight

Manufacturer profiles associated with Flight.

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the difference between single and twin-screw extruders?

Single-screw extruders use one rotating screw for simpler, high-volume processing of uniform polymers. Twin-screw extruders use two intermeshing or non-intermeshing screws for better mixing, venting, and processing of complex blends or filled materials.

How does screw design affect extrusion quality?

Screw geometry (L/D ratio, compression, flight design) influences melting efficiency, mixing, pressure stability, and output rate. Poor design can cause melt temperature variations, degradation, or inconsistent product dimensions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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