INDUSTRY COMPONENT

Barrel Body / Liner

A precision cylindrical component in temperature-controlled barrels that houses the screw and provides thermal management for material processing.

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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
  • 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
Standards
ISO 15590, DIN 16742, ASTM A681

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Barrel Body / Liner.

barrel liner extrusion barrel injection molding barrel bimetallic barrel temperature-controlled barrel screw barrel polymer processing wear-resistant liner thermal management Barrel Body / Liner Barrel Body / Liner in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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%.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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