Extruder Barrel: Pressure Rating Up to 50 MPa

Component Specifications

Definition

The extruder barrel is a critical component in plastic film blowing machines, serving as the primary chamber where polymer pellets or granules are conveyed, compressed, melted, and homogenized under controlled temperature and pressure. It houses the rotating screw and provides the necessary thermal and mechanical environment for plasticization before the material exits through the die to form film bubbles.

Working Principle

Works by receiving polymer feedstock through a hopper, where a rotating screw inside the barrel conveys the material forward. As it moves, external heaters and internal shear heat melt the polymer, while the barrel's geometry and temperature zones ensure uniform melting and pressure buildup for consistent extrusion.

Materials

Typically made from nitrided steel (e.g., 38CrMoAlA) or bimetallic alloys with inner linings of wear-resistant materials like Xaloy or bimetallic compounds to withstand abrasion, corrosion, and high temperatures up to 300-400°C.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Heating Zones	3 to 7 zones
Cooling Method	Air or water cooling jackets
Inner Diameter	45mm to 150mm (varies by machine capacity)
Max Temperature	400°C
Pressure Rating	Up to 50 MPa
Length To Diameter Ratio	20:1 to 30:1

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 12163, DIN 16780

Parent Products

This component is used in the following industrial products

Plastic Film Blowing Machine

Industrial machine that produces plastic film by extruding molten polymer through a circular die and inflating it into a bubble.

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Twin-Screw Polymer Compounding Extruder

Industrial machine for melting, mixing, and homogenizing plastic compounds with additives

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Engineering Analysis

Risks & Mitigation

Material degradation due to overheating
Wear from abrasive polymers
Pressure fluctuations causing output inconsistencies
Thermal stress cracks

FMEA Triads

Trigger: Abrasive polymer compounds
Failure: Barrel inner surface wear leading to reduced pressure and output
Mitigation: Use bimetallic linings, regular inspections, and proper material selection

Trigger: Improper temperature control
Failure: Polymer degradation or incomplete melting
Mitigation: Implement PID controllers, calibrate heaters, and monitor zone temperatures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Inner diameter tolerance ±0.05mm, straightness within 0.02mm/m

Test Method

Dimensional checks with micrometers, pressure testing up to 60 MPa, thermal imaging for heat distribution

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 Extruder Barrel

Manufacturer profiles associated with Extruder Barrel.

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Related Components

Sealant Layer

Sealant layer in multi-layer co-extruded barrier films for hermetic sealing and product protection.

Tie Layer

Tie layer is a bonding component in multi-layer co-extruded barrier films that ensures adhesion between incompatible polymer layers.

Mold Release Coating

Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

Silicone polymer base is a high-temperature resistant polymer material used as the foundational component in silicone rubber compounds for industrial applications.

Frequently Asked Questions

What is the purpose of multiple heating zones in an extruder barrel?

Multiple heating zones allow precise temperature control along the barrel length, ensuring gradual polymer melting, preventing degradation, and achieving uniform melt viscosity for consistent film quality.

How often should an extruder barrel be replaced?

Replacement depends on usage, material abrasiveness, and maintenance; typically, barrels last 2-5 years. Signs for replacement include excessive wear, loss of pressure, or inconsistent output.

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.

Extruder Barrel