223mm POM Polymerization Extruder Barrel — Repair & Redesign for Maris 223 Machine

Overview: Precision Barrel Solution for POM Polymerization Extruder

This project involves the refurbishment and redesign of a 223mm inner bore polymerization barrel used in POM (polyoxymethylene) production, originally from the Italian Maris 223 twin screw extruder.
The client required a full performance restoration of a worn barrel and the design of an upgraded replacement that could withstand the demanding chemical and thermal stresses of polymerization extrusion.

ZHITIAN’s engineering team provided both reconditioning and OEM replacement manufacturing, delivering solutions that match — and in many aspects exceed — the technical standards of German and Japanese extruder component manufacturers.

Laser Cladding Nickel-Tungsten Carbide Barrel Surface Technology

Instead of conventional nitriding or surface hardening, ZHITIAN applied advanced laser cladding technology to the barrel’s inner surface.
The cladded layer, composed of nickel-based tungsten carbide (Ni-WC) metal ceramic, forms a dense metallurgical bond with the base material, providing:

• Exceptional wear and corrosion resistance
• Uniform hardness and stress-free surface
• Superior resistance to chemical erosion from POM polymerization gases

This process avoids hardness inconsistency between the surface and core, reduces residual stresses, and eliminates the risk of stress cracking common in thermally treated barrels.

Internal Cooling Channel Design for Thermal Stability

The internal water cooling channels were redesigned to optimize temperature regulation under pulsed cooling conditions.
ZHITIAN engineers analyzed the stress distribution using 3D thermal simulation, ensuring:

• Stable barrel wall temperature during cyclic heating and cooling
• Prevention of thermal fatigue cracks and internal coolant leakage
• Improved extrusion consistency and barrel longevity

High-Precision Machining for OEM Replacement Compatibility

Each redesigned barrel is CNC-machined to micron-level accuracy, ensuring perfect fit and alignment with the Maris 223 twin screw assembly.
Key tolerances are controlled to international standards — comparable to top-tier manufacturers in Germany and Japan.

Experience in Chemical Extrusion Projects and Imported Equipment Retrofit

ZHITIAN has accumulated extensive expertise in extruder barrel repair, modification, and OEM replacement for large chemical polymerization plants and imported extrusion equipment.
Our deep understanding of process behavior, material properties, and thermal management ensures long-term stability and reliability of the extrusion system.

Results: Enhanced Durability and Process Reliability

The 223mm Maris POM Polymerization Barrel Project showcases ZHITIAN’s capability in precision machining, materials engineering, and extrusion system optimization.
By combining laser cladding of Ni-WC metal ceramic and optimized cooling design, we helped the customer achieve:

• Extended barrel life by over 3×
• Enhanced thermal stability
• Zero water leakage or stress cracking after continuous operation

ZHITIAN continues to deliver advanced twin screw extruder barrel solutions for demanding polymerization and compounding applications worldwide.