Corrosion Resistance and Compatibility of Mixing Tubing: Ensuring Safety and Stability in Dispensing Processes

The corrosion resistance and adhesive compatibility of mixing tubing materials are critical for preventing dispensing contamination and equipment damage:

Chemical Corrosion Risks: Certain industrial adhesives (e.g., acidic epoxy, solvent-based polyurethane) exhibit strong corrosive properties. Standard PP mixing tubes are susceptible to corrosion, leading to wall peeling that contaminates adhesive and clogs dispensing nozzles. In contrast, tubes made from modified PPS or PTFE withstand most corrosive adhesives, ensuring clean, contamination-free dispensing.

Insufficient Temperature Adaptability: In high-temperature dispensing scenarios (e.g., thermal conductive adhesives for LED chip packaging), standard plastic mixing tubes may soften and deform, causing internal blades to misalign and disrupting the mixing mechanism. High-temperature resistant mixing tubes (e.g., LCP material withstanding temperatures above 200°C) maintain structural integrity, ensuring consistent mixing performance under elevated conditions.

Mixing Tube Structural Stability and Dimensional Accuracy: Preventing Dispensing Deviation and Process Failure

The structural stability and dimensional accuracy of mixing tubes directly impact dispensing positioning precision and assembly compatibility:

Blade Structural Stability: If internal blades are poorly secured or prone to loosening, high-pressure dispensing can cause blade displacement or fracture. This disrupts the “segmentation-recombination” mixing process, drastically reducing mixing effectiveness. Premium mixing tubes employ integrated injection molding to ensure tight blade-to-tube bonding, withstanding dispensing pressures of 0.8-1.2MPa without deformation.

Interface Dimensional Accuracy: Dimensional deviations in the interfaces between the mixing tube and dispensing valve/needle (e.g., outer diameter tolerances exceeding ±0.1mm) cause adhesive leakage at connection points. This not only wastes adhesive but also contaminates workpiece surfaces, increasing subsequent cleanup costs. High-precision interface designs (e.g., using ISO standard interfaces) enable seamless connections, eliminating leakage issues.