Co-rotating Twin Screw Extruder Barrel

The screw barrel of the co rotating twin screw extruder is a high-precision mechanical component designed specifically for co rotating twin screw extruders. As a closed cavity for screw rotation, the barrel of the twin screw extruder provides materials with an excellent processing environment that is wear-resistant, corrosion-resistant, and thermally stable. This product is positioned as the core component of high-end mixing production lines, suitable for high torque, high filling, and high shear working conditions, ensuring uniform plasticization and efficient conveying of materials inside the screw barrel.

·Bimetallic centrifugal casting lining: using high wear-resistant nickel hard alloy or tungsten carbide lining layer, combined with low carbon steel matrix metallurgy, significantly improves the wear resistance of high filling formulas (such as 60%~80% calcium carbonate, glass fiber, mineral fillers).
·Optimization of cooling channel structure: Spiral or axial parallel cooling channel design with high heat transfer efficiency ensures precise temperature control of the barrel body for thermosensitive materials and reactive extrusion processes.
·High precision flange end face: The mating end face is precisely ground to ensure coaxiality and sealing with adjacent barrels and threaded components, avoiding material leakage and extending the overall life of the screw barrel.
·Multiple material configurations: Various options such as nitride steel (38CrMoAlA), bimetallic, and full HIP (hot isostatic pressing) composite lining can be selected to match different corrosion and wear process requirements.
·Modular segmented design: seamlessly integrated with the extruder system, supporting flexible aspect ratio configurations, facilitating maintenance and upgrades of mechanical components.

Noted: Details depend on your requirements and need.

The twin screw extruder barrel produced by Nanjing Kelongwell Chemical Machinery Co., Ltd. is centered on "matching accuracy", significantly reducing the risk of downtime caused by wear and tear. Unlike ordinary mechanical parts, our bimetallic barrel adopts metallurgical bonding technology to completely eliminate the hidden danger of lining peeling. At the same time, the geometric tolerance of the inner hole is strictly controlled at the micrometer level to ensure optimal shear strength between the screw and the barrel, thereby achieving efficient dispersion and distribution mixing. Compared to ordinary accessories, this product can extend its lifespan by more than three times under strong wear and tear conditions, and bring higher unit output and lower energy consumption per ton of material.

·Engineering plastic modification: PBT, PA6/66, PC/ABS and other reinforcing materials (glass fiber content 30%~50%), mineral filling.
·Production of color masterbatch: high concentration white, black, and colored masterbatch (PE, PP, PS carriers).
·Reactive extrusion: condensation reaction, grafting reaction (such as maleic anhydride grafting), crosslinking reaction.
·Special materials: thermoplastic elastomers (TPE, TPV), wood plastic composites (WPC), battery slurry electrode materials.
·Recycling granulation: post consumer recycled plastics with high pollution content (PCR).

Nanjing Kelongwell Chemical Machinery Co., Ltd. provides comprehensive OEM/ODM mechanical parts customization services. We are well aware that the twin screw extruder barrel is the core of the production line, therefore we provide:
·Material customization: Based on the silicon dioxide content and halogen corrosiveness in the formula, recommend the best lining alloy solution.
·Structural customization: Optimize cooling channels for special thermal field requirements; Special interfaces such as side feeding ports and liquid injection ports can be designed.
·Size restoration: For discontinued or imported models, reverse engineering is used to manufacture a twin screw extruder barrel that is completely identical in size to the original screw components and flange installation, ensuring seamless replacement.

Q1: What is the difference between nitriding barrel and bimetallic twin screw extruder barrel?
A: The nitriding barrel is hardened by surface nitriding and is suitable for ordinary filling modification or processes with low wear resistance. The barrel of the bimetallic twin screw extruder adopts centrifugal casting technology, lined with nickel hard alloy or tungsten carbide, with a thicker hardened layer and higher hardness (HRC 60 or above), making it an ideal choice for processing high wear materials such as fiberglass reinforced engineering plastics and high concentration color masterbatch.

Q2: How can I determine if my existing screws and barrel have been severely worn?
A: Typical manifestations include: significant decrease in extrusion volume, appearance of non melting or impurities in the product, and the need to increase screw speed to maintain production. The key indicator is to measure the gap between the screw and the barrel. When the radial clearance exceeds 0.5mm~0.8mm (depending on the model), it is recommended to replace the barrel or screw components to restore the shear efficiency of the twin screw extruder screw barrel.

Q3: Can your company produce barrels that match imported extruders (such as German and Japanese brands)?
A: Okay. Our customized services are designed specifically for such needs. Nanjing Kelongwell Chemical Machinery Co., Ltd. can manufacture twin screw extruder barrels with flange dimensions, cooling interfaces, and internal hole tolerances that are completely consistent with imported models through reverse engineering and high-precision processing, helping customers overcome the problems of long delivery times and high costs of original parts.

Q4: What impact does cooling channel design have on the process?
A: The cooling channel structure directly affects the uniformity of the temperature field of the barrel. We adopt a spiral or multi zone parallel flow channel design to ensure that the heat generated by high shear can be quickly and evenly dissipated. For reaction extrusion or PVC, bio based thermosensitive materials, reasonable cooling of the screw barrel can prevent material carbonization and ensure the stability of the reaction process.

Q5: What is the usual delivery time for customized twin screw extruder barrels?
A: The delivery time depends on the material and complexity. Standard nitriding mechanical components usually take 15-20 working days; The barrel of the bimetallic twin screw extruder involves centrifugal casting and specialized heat treatment, with a standard cycle of 25-35 working days. If there is an urgent need for replacement, we can negotiate for expedited production scheduling.