Polymer Extrusion Barrel Liner

Product Specifications

Technical details and manufacturing context for Polymer Extrusion Barrel Liner

Definition

A precision-machined cylindrical liner that fits inside extrusion barrels to protect against polymer abrasion and corrosion. This component ensures consistent polymer flow and temperature distribution during plastic processing. It extends barrel lifespan by providing a sacrificial wear surface that can be replaced independently. Critical for maintaining dimensional accuracy and preventing contamination in high-volume production. The liner is available in bimetallic alloy (steel base with hard-facing), nitrided steel, or carbide-reinforced composite. Key parameters include inner diameter 20–200 mm, length 500–3000 mm, wall thickness 5–20 mm, surface hardness 58–62 HRC (ASTM E18), maximum operating temperature 400 °C, thermal expansion coefficient 11–13 ×10^-6/°C (ASTM E831), operating pressure 1.0–1.6 MPa, tensile strength 800–1200 MPa (ASTM E8), density 7.8–8.1 g/cm³ (ASTM B311), surface roughness 0.2–0.4 μm Ra (ISO 4287), inner diameter tolerance ±0.05 mm (ISO 286), and weight 5–100 kg. These values are directory reference ranges; verify model-specific values with the legal manufacturer or supplier. The liner is a component for plastics in primary forms manufacturing, used in extrusion machinery. It is not a standalone product but an integral part of the barrel assembly. Proper selection requires matching the inner diameter to the extrusion screw, considering the polymer type, operating temperature, and pressure. The liner's wear resistance and thermal conductivity are critical for efficient melting and consistent output. Maintenance signals include increased back pressure, reduced throughput, or visible wear on the liner surface. Failure boundaries include cracking, excessive wear, or loss of dimensional accuracy. The liner is designed to be replaced independently, reducing downtime and maintenance costs. Always consult the equipment manufacturer for specific installation and maintenance procedures.

Working Principle

The liner acts as a sacrificial wear surface between the rotating screw and the stationary barrel. It reduces friction and prevents direct barrel damage while maintaining thermal conductivity for polymer melting. The liner absorbs wear from abrasive polymer compounds and corrosion from reactive additives, protecting the more expensive barrel. Its precision bore ensures consistent clearance with the screw, promoting uniform polymer flow and temperature distribution. The liner's material and hardness are selected to withstand the operating conditions, and its thermal expansion characteristics must match the barrel to avoid distortion. Over time, the liner wears, and its replacement restores the barrel's performance.

Common Materials

Bimetallic Alloy (steel base with hard-facing), Nitrided Steel, Carbide-Reinforced Composite

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inner DiameterRequired	20–200 mm	Precision bore size matching extrusion screw
LengthRequired	500–3000 mm	Axial dimension of liner assembly
Wall ThicknessRequired	5–20 mm	Radial thickness of wear-resistant layer
Surface HardnessRequired	58–62 HRC	Rockwell hardness of wear-facing materialASTM E18
Maximum Operating TemperatureRequired	400 °C	Continuous service temperature limit
Thermal Expansion Coefficient	11–13 10^-6/°C	Dimensional change with temperature variationASTM E831
Tensile Strength	800–1200 MPa	Ensures structural integrity under loadASTM E8
Density	7.8–8.1 g/cm³	Affects weight and thermal propertiesASTM B311
Surface Roughness	0.2–0.4 μm Ra	Smoother surface reduces material adhesionISO 4287
Tolerance (Inner Diameter)	±0.05 mm	Critical for screw clearanceISO 286
Weight	5–100 kg	Depends on dimensions and material

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

Components / BOM

Bimetallic Liner Tube Part
Primary wear-resistant cylindrical body

Material: Steel substrate with alloy overlay
Cooling Channel Insert Optional Part
Integrated cooling passage for temperature control

Material: Copper alloy or stainless steel
Mounting Flange Part
Interface for securing liner to barrel housing

Material: Carbon steel
Thermal Barrier Coating Optional Part
Surface treatment to reduce heat transfer

Material: Ceramic or composite coating

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Polymer Extrusion Barrel Liner.

Manufacturers of Polymer Extrusion Barrel Liner

Manufacturer profiles associated with Polymer Extrusion Barrel Liner.

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Frequently Asked Questions

What materials are available for the liner?

The liner can be made from bimetallic alloy (steel base with hard-facing), nitrided steel, or carbide-reinforced composite. The choice depends on the application requirements such as abrasion resistance, corrosion resistance, and operating temperature.

What are the typical dimensions and tolerances?

The inner diameter ranges from 20 to 200 mm, length from 500 to 3000 mm, and wall thickness from 5 to 20 mm. The inner diameter tolerance is ±0.05 mm per ISO 286. These are reference ranges; exact values must be confirmed for the specific model.

How does the liner affect extrusion performance?

The liner provides a smooth, wear-resistant surface that maintains consistent clearance with the screw, ensuring uniform polymer flow and temperature distribution. It also protects the barrel from abrasion and corrosion, extending its lifespan and reducing downtime.

What are the maintenance and replacement signals?

Signs that the liner may need replacement include increased back pressure, reduced throughput, or visible wear on the liner surface. Regular inspection and measurement of the inner diameter can help determine when replacement is necessary.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 50 MPa (7,250 psi)
flow rate:	Up to 500 kg/h (1,102 lb/h)
temperature:	Up to 300°C (572°F)
slurry concentration:	Not applicable (for polymer melts only)

Product Specifications

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