Barrel Liner: Pressure Rating Up to 70MPa

Component Specifications

Definition

The barrel liner is a critical wear component installed inside the extruder barrel of plastic processing machinery. It serves as a sacrificial layer that protects the main barrel structure from abrasive and corrosive materials during the extrusion process. Typically manufactured as a cylindrical sleeve, it maintains dimensional stability while withstanding high temperatures, pressures, and mechanical stresses during polymer melting and conveying.

Working Principle

The barrel liner operates by creating a durable, smooth inner surface that facilitates material flow while protecting the barrel from direct contact with processed materials. It reduces friction between the rotating screw and stationary barrel, minimizes material degradation, and maintains consistent processing conditions. The liner's thermal conductivity properties help regulate temperature distribution along the barrel length.

Materials

Typically manufactured from nitrided steels (38CrMoAlA), bimetallic alloys (stellite/cobalt-based overlays), or specialized tool steels (H13, D2). Advanced versions use ceramic coatings or tungsten carbide composites for extreme wear resistance. Material selection depends on processed polymers, operating temperatures (typically 150-350°C), and abrasion requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	Standard lengths from 500mm to 3000mm
Inner Diameter	Customized to barrel specifications (typically 25-300mm)
Surface Finish	Ra 0.2-0.8μm
Wall Thickness	15-50mm depending on application
Pressure Rating	Up to 70MPa
Surface Hardness	HRC 58-65 (nitrided), HRC 40-55 (bimetallic)
Operating Temperature	Up to 400°C

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

Standards

DIN 16780, ASTM A681

Parent Products

This component is used in the following industrial products

Extruder Barrel

The cylindrical housing that contains the screws and provides the processing environment for polymer compounding.

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Engineering Analysis

Risks & Mitigation

Premature wear from abrasive materials
Thermal stress cracking
Corrosion from processing additives
Improper installation causing leaks
Reduced efficiency from worn surfaces

FMEA Triads

Trigger: Abrasive polymer compounds containing fillers like glass fibers or minerals
Failure: Excessive wear leading to increased clearance between screw and barrel
Mitigation: Use bimetallic or carbide-lined liners; implement regular inspection schedules; optimize processing parameters to reduce wear

Trigger: Thermal cycling and uneven heating
Failure: Cracking or distortion of liner material
Mitigation: Ensure proper preheating procedures; maintain consistent temperature control; use materials with good thermal shock resistance

Trigger: Chemical corrosion from processing additives
Failure: Pitting and surface degradation
Mitigation: Select corrosion-resistant materials; implement proper cleaning procedures; monitor additive concentrations

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Inner diameter tolerance: ±0.05mm; Straightness: 0.05mm/m; Concentricity: 0.03mm TIR

Test Method

Dimensional verification with CMM; Hardness testing (Rockwell C); Surface roughness measurement; Pressure testing at 1.5x operating pressure; Thermal cycling tests

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.

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Manufacturers of Barrel Liner

Manufacturer profiles associated with Barrel Liner.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

How often should barrel liners be replaced?

Replacement intervals depend on processed materials and operating conditions. For abrasive materials like filled compounds, replacement may be needed every 6-12 months, while standard polymers may allow 2-5 years of service. Regular inspection of wear patterns and dimensional changes is recommended.

What are the signs of barrel liner wear?

Key indicators include reduced output rates, increased energy consumption, inconsistent melt temperature, visible scoring or grooves on the inner surface, polymer degradation (burn marks), and difficulty maintaining processing parameters.

Can barrel liners be repaired or reconditioned?

Minor surface damage can sometimes be repaired through honing or polishing, but significant wear typically requires complete replacement. Bimetallic liners with overlay coatings cannot be effectively repaired once the wear-resistant layer is compromised.

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.

Barrel Liner