Bubble Defects in Resin Coating: Degassing and Viscosity Control.
A working reference designed to be printed and used at the line. It complements the failure case studies in the Technician Hub with the standard documents those cases eventually produced.
Common Mistakes and How to Avoid Them
| Mistake | Why It Happens | Practical Fix |
|---|---|---|
| 1. Mixing by bottle caps | Ratio drift cures soft or brittle | Cup test every batch; scale by weight |
| 2. Letting pot life expire in the gun | Cured blocks waste nozzles and time | Batch size per pot life clock |
Best Practices
- Scale for weight-based mixing
- Pot life timer at the mix bench
- Nozzle purge log per shift
Batch Start Sequence
- Weight-based mix - Per data sheet ratio (Caps drift; scales don't)
- Cup test the mix - Cure check in pot life (Log every result)
- Purge and clock - Start pot life timer (Expired resin blocks guns)
Scale at bench | Nozzle purge log per shift
Resin Process Reference
Two-part resin handling windows for puller coating.
| Parameter | Reference | Why It Matters |
|---|---|---|
| Mix ratio | By weight, per data sheet | Drift gives soft or brittle film |
| Pot life | Per data sheet | Oversized batches waste material |
| Degassing | Vacuum or rest time | Bubbles copy into coating |
| Nozzle purge | Daily start and end | Prevents cured blockages |
The scale replaced the caps
Scenario. Soft patches appeared randomly in resin coatings.
Action. Weight-based mixing with a cup-test record per batch.
Result. Soft patches disappeared; material use per thousand parts stabilized.
Frequently Asked Questions
Why weight, not volume, for mixing?
Volume measures drift with viscosity and operator technique. Weight-based mixing is repeatable.
What is pot life and why time it?
The working time after mixing. Oversized batches cure in the pot and the gun.
What causes bubbles in the coating?
Entrapped air and moisture. Degas per process and keep viscosity in band.
Implementation Roadmap
| Step | Frequency |
|---|---|
| Nozzle care live | Daily |
| Cup test records live | Every batch |
| Consumption tracking | Month 1 |
What Would You Like to Solve?
If you would like this checklist or template adapted to your own line and part mix, contact QLQ we supply the full equipment and chemistry package along with the working documents that make it run.
FAQ - Bubble Defects in Resin Coating: Degassing and Viscosity Control
Straight answers from the shop floor. Ask us on WhatsApp if your case is different.