Successful injection mold design requires balancing part requirements, material behavior, tooling cost, and production efficiency. Use DFM best practices, mold-flow simulation for complex parts, and prototyping to validate assumptions. Iterative refinement between part designers and mold makers will minimize risks and produce consistent, high-quality parts.
If you want, I can:
Related search suggestions will be prepared. injection mold design guide
Every resin shrinks as it cools. You cannot cut a mold to the nominal part dimension.
Air must escape as plastic fills the mold. If not, the air compresses, heats up, and causes dieseling (burn marks) or incomplete filling. Related search suggestions will be prepared
Before we look at specific features, we must adopt the mindset of the mold maker. An injection mold is a pressurized vessel. Typical melt pressures range from 10,000 to 30,000 PSI. Every design decision must answer one question: How does this affect melt flow and ejection?
Your material dictates steel type, vent depth, and surface finish. Every resin shrinks as it cools
| Material | Shrinkage | Mold Steel | Vent Depth | Corrosion Risk | | :--- | :--- | :--- | :--- | :--- | | ABS | Low | P20 (standard) | 0.03mm – 0.05mm | Low | | PC (Polycarbonate) | Low | H13 / Stainless | 0.02mm – 0.03mm | Low (requires dry steel) | | PVC | High | Stainless (420) | 0.01mm – 0.02mm | High (releases HCl gas) | | POM (Acetal) | High | P20 / H13 | 0.01mm | Moderate (degassing needed) | | Glass-filled Nylon | Low | Hardened H13 | 0.02mm (abrasive) | Low (abrasive wear on gates) |
Critical Note for PVC/Plasticized materials: They off-gas. Your mold must have deep, easy-to-clean vents, and the steel must be stainless to prevent pitting corrosion.