Four Screw Cleaning Methods for Twin-Screw Extruders in Modified Plastics Production: Principles, Operations, And Limitations

Screw cleaning is critical to product quality in modified plastics production, yet often overlooked. This article analyzes four common cleaning methods for twin-screw extruders—resin cleaning, disassembly and manual cleaning, flame cleaning, and water-based cleaning—covering their operational principles, key process steps, precautions, and limitations. It provides practical guidance for selecting and combining cleaning methods based on material characteristics, equipment condition, quality requirements, and cost-effectiveness, while emphasizing standardized operations and regular maintenance to extend equipment service life.

Screw and Barrel Wear in Plastic Processing: Causes, Types, and Predictive Maintenance

Common Feeding Methods in PVC Plastic Extrusion Production Lines

For PVC plastic extrusion production lines, feeding method selection depends on material form and process requirements. Three common systems are compared: spring feeders (quick to clean, suitable for frequent color changes but poor with high-filler powders), screw feeders (high flow rate and anti-bridging, ideal for high-filler powders but not for fiber-reinforced materials), and vacuum feeders (dust-free and closed-loop, best for cleanrooms and fiber reinforcement but limited at high output).

The “Culprits” Behind PVC Screw Breakage and Countermeasures

Most screw breakages are caused by the reasons mentioned above. Regular inspection of the gearbox, ensuring adequate heating temperature, avoiding material interruptions, strictly following formulas, and preventing foreign objects in raw materials can effectively reduce the risk of screw breakage.