Barrel Liner for Twin Screw Extruder

Extruder barrel liners are wear-resistant inner sleeves embedded inside main extruder barrels and side feeder barrels. As consumable core parts, they directly contact screws and raw materials, protecting the outer barrel body against abrasion and corrosion while supporting precise temperature control.

• Integral / Split Structure 
  Small extruders adopt single-bore integral liners; co-rotating twin-screw extruders use 8-shaped twin-bore liners; side feeders are equipped with parallel twin-bore liners with precise conjugate inner curves matching twin screw clearance.
• Dual-Layer Construction 
  Low-carbon steel outer base for tight shrink-fit assembly; inner surface coated or hardfaced with wear-resistant alloy (tungsten carbide, nickel/cobalt base) for high friction resistance.
• Reserved Cooling & Thermowell Holes 
  Cooling water grooves machined on outer wall with reserved temperature sensing holes to accurately control processing temperature; simplified cooling structure for side feeder liners without high-temperature working conditions.
• Precision Tolerance Matching 
  Strict unilateral clearance between liner bore and screw balances shear mixing and conveying performance; worn liners can be replaced separately instead of the whole expensive barrel.

• Wear Protection
  Protects the main barrel body from abrasion and corrosion, extending the service life of the equipment.
• Precision Clearance Control
  Maintains the designed clearance between the screw and barrel to ensure stable conveying, mixing, and pressure building.
• Harsh Material Processing
  Performs reliably when processing glass fiber, mineral fillers, high-load powders, and corrosive compounds.
• Cost-Effective Maintenance
  Allows worn liners to be replaced independently, reducing maintenance costs and minimizing production downtime.
• Efficient Heat Transfer
  Provides excellent heat transfer to work with the barrel temperature control system, ensuring stable processing of heat-sensitive materials such as PLA and PVC.

• Nitrided Alloy Steel Liner (General Grade) 
  Surface nitriding for surface hardening, cost-effective; for general plastic modification, low glass fiber and standard color masterbatch production.
• Nickel-Based Tungsten Carbide Hardfaced Liner (Heavy Wear Grade) 
  Thick tungsten carbide alloy inner layer with ultra-high wear resistance; for high glass fiber, high CaCO3, carbon black and lithium battery powder production lines.
• Cobalt-Based Alloy Liner (High Corrosion & Temp Grade) 
  Outstanding high-temperature and acid/alkali resistance; for PVC, flame retardant masterbatch and degradable materials with corrosive additives.
• Bimetallic Liner (Industry Standard) 
  Steel outer shell + centrifugal cast wear-resistant alloy inner layer, balancing strength, wear resistance and cost; standard for most compounding and pelletizing lines.

• Low Maintenance Cost
  The replaceable liner design eliminates the need for costly full barrel replacement, reducing maintenance expenses.
• Custom Material Options
  Available in a variety of wear-resistant and corrosion-resistant alloy materials to meet different processing requirements.
• Easy Installation & Replacement
  Standard hot-shrink assembly enables quick disassembly and replacement, minimizing maintenance downtime.
• Stable Heat Transfer
  Uniform wall thickness ensures efficient heat conduction and temperature consistency, reducing burnt particles and thermal degradation.
• Smooth Inner Surface
  A polished inner surface minimizes material adhesion and residue buildup, making it ideal for frequent color or material changes.

• Excessive Clearance
  The clearance between the screw and liner exceeds the recommended limit, resulting in material backflow, reduced throughput, and poor mixing performance.
• Severe Wear
  The inner alloy layer exhibits scratches, peeling, or excessive wear, leading to black specks and product contamination.
• Corrosion Damage
  Corrosion pits, leakage, or unstable temperature distribution negatively affect processing stability and material quality.
• Abnormal Operation
  Abnormal noise, vibration, or noticeable friction during screw operation indicates that liner replacement is recommended.

• Targeted Material & Process Optimization: Optimize base material formulation and heat treatment processes to improve wear resistance, corrosion resistance and impact resistance
• Custom Production per Drawings & Samples: Precisely manufacture replacement elements perfectly compatible with your equipment
• 100% Full Inspection Before Delivery: Complete dimensional quality inspection with full inspection reports
• 24-Hour Responsive After-Sales Service: Exclusive after-sales channels with 24-hour response time
• Professional Selection & Process Consultation: Technical advice on screw element configuration, material selection and screw arrangement solutions
• Reverse Engineering & Non-Standard Customization: High-precision reverse engineering for obsolete equipment models
• Rapid Prototyping & Small-Batch Trial Production: Support for new solutions to shorten R&D cycles
• Service Life Assessment & Optimization Guidance: Regular product status tracking and wear detection
• Flexible Stock & Delivery Guarantee: Safety stock service for regular spare parts and urgent orders

• Properties: High precision, high quality, long service life, wear-resistant, corrosion-resistant and durable.
• Compatibility: Compatible with most well-known extruders