- Mix Ratio Drift
Symptoms: soft or tacky cured parts, or excessive exotherm. Causes: pump wear, calibration drift or pressure imbalance between the two supply systems. Fix: recalibrate the weekly, inspect gears and seals for wear, and verify supply pressures are equal. A two-component epoxy dispensing system with flow-meter feedback will alarm automatically when the ratio leaves tolerance, preventing defective parts before they are dispensed.
- Air Bubbles and Voids in the Cured Part
- Symptoms: bubbles visible on the surface or voids found in cross-section. Causes: air entrained during mixing, trapped air in deep cavities, or insufficient degassing. Fix: degas both components before use, slow the dispensing speed so resin flows from the bottom up, and use vacuum potting for deep or narrow cavities. Keep the needle immersed below the rising liquid level to minimize air entrapment.
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Symptoms: intermittent flow, starved dots or pressure spikes. Causes: cured resin left in the nozzle, abrasive fillers settling, or insufficient purging. Fix: purge the system with solvent at the end of each shift, replace disposable static mixers on schedule, and use larger-bore needles for filled materials. Never let a two-component epoxy dispensing system sit idle with mixed material in the nozzle; always purge before any pause longer than the working life.
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Symptoms: thin strands of adhesive pulled from the nozzle after dispensing. Causes: material too viscous, needle too far from the substrate, or insufficient suck-back. Fix: enable the suck-back (vacuum retract) function on the dispensing controller, increase the retraction distance, or slightly heat the material to reduce viscosity. Adjust the needle height so the tip is close to the surface without touching it.
Conclusion
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Shenzhen Second Intelligent Equipment Co., Ltd two-component epoxy dispensing system problems share common roots: inadequate cleaning, poor calibration and unstable material handling. By applying these eight fixes and establishing disciplined preventive maintenance, manufacturers can keep their potting line running smoothly, producing consistent, void-free parts day after day.
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