How to Optimize Gas Venting with Taperless Ejector Pins
Key Takeaway: Taperless gas vent pins combine two functions: simplified mounting + gas evacuation. Optimize venting by selecting groove depth (0.02–0.05mm) and groove count (1–4) to match your resin's gas generation rate.
Venting Groove Parameters
| Parameter | Single Groove | Dual Groove | Quad Groove |
|---|---|---|---|
| Venting area (ø5mm pin) | ~0.5 mm² | ~1.0 mm² | ~2.0 mm² |
| Flash risk | Minimal | Low | Moderate — check resin viscosity |
| Best for | Standard resins, mild gas | Glass-filled, moderate gas | POM, PA+GF, heavy gas |
| Pin strength impact | Negligible | <3% reduction | 5–8% reduction |
Optimization Process
Start with single groove and run trial shots. If burn marks persist at the pin location, upgrade to dual groove. Quad groove is a last resort — verify that your resin viscosity is high enough to prevent flash at the groove interface. For ultra-low-viscosity resins, maximum groove depth should be 0.02mm regardless of groove count.