Barrel Body / Liner: Temperature Range 20-450°C

Component Specifications

Definition

The barrel body/liner is a critical cylindrical component in temperature-controlled barrels used in extrusion and injection molding machinery. It serves as the primary housing for the rotating screw and provides controlled thermal environments for material melting, mixing, and conveying. Engineered with precise internal dimensions and surface finishes, it maintains consistent material flow while withstanding high pressures, temperatures, and mechanical stresses during continuous operation.

Working Principle

The barrel body/liner operates by containing and guiding material through controlled thermal zones while housing the rotating screw. Heat transfer occurs through external heating bands and internal cooling channels, maintaining precise temperature profiles. The smooth internal surface minimizes friction and material degradation while ensuring consistent material flow and pressure development along the barrel length.

Materials

Bimetallic construction with nitrided steel (38CrMoAlA) or tool steel (H13) inner liner and alloy steel outer shell. Advanced versions use tungsten carbide coatings or ceramic composites for enhanced wear resistance. Heat treatment includes nitriding (0.3-0.5mm case depth) or induction hardening to achieve 58-62 HRC surface hardness.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Straightness	≤0.05mm/m
Concentricity	≤0.03mm
Surface Roughness	Ra 0.2-0.4μm
Temperature Range	20-450°C
Length To Diameter Ratio	20:1 to 30:1
Maximum Operating Pressure	200-350 MPa
Internal Diameter Tolerance	±0.05mm

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 15590, DIN 16742, ASTM A681

Parent Products

This component is used in the following industrial products

Temperature-Controlled Barrel

A precisely temperature-regulated cylindrical chamber in a Polymer Melt Flow Index Tester where polymer granules are melted under controlled conditions.

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Engineering Analysis

Risks & Mitigation

Excessive wear leading to material degradation
Thermal stress cracking
Poor temperature control affecting product quality
Misalignment causing screw damage
Corrosion from aggressive materials

FMEA Triads

Trigger: Abrasive material processing without proper liner hardness
Failure: Premature wear and increased clearance affecting pressure development
Mitigation: Use bimetallic liners with tungsten carbide coatings and implement material screening

Trigger: Thermal cycling beyond design limits
Failure: Micro-cracking and reduced structural integrity
Mitigation: Implement gradual temperature ramping and maintain within specified operating ranges

Trigger: Improper installation or alignment
Failure: Uneven wear and screw binding
Mitigation: Follow precise installation procedures with laser alignment tools and torque specifications

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general dimensions, ISO 286-2 for bore tolerances

Test Method

Ultrasonic testing for material integrity, coordinate measuring for dimensional accuracy, hardness testing per ISO 6508

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 Barrel Body / Liner

Manufacturer profiles associated with Barrel Body / 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

What is the purpose of bimetallic construction in barrel liners?

Bimetallic construction combines a wear-resistant inner liner (nitrided steel or tungsten carbide) with a tough outer shell, providing excellent abrasion resistance while maintaining structural integrity under high pressure and temperature conditions.

How often should barrel liners be inspected for wear?

Regular inspection every 500-1000 operating hours is recommended, with dimensional checks using bore gauges. Significant wear (>0.2mm diameter increase) or surface scoring requires replacement to maintain processing quality.

What factors affect barrel liner lifespan?

Key factors include material abrasiveness, processing temperatures, screw design, maintenance practices, and proper alignment. Using compatible materials and maintaining optimal operating conditions can extend service life by 30-50%.

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 Body / Liner