Injection Mold Design Guide Fix Jun 2026

| Feature | Movement direction | Max stroke | Typical actuator | |---------|-------------------|------------|------------------| | Slide (cam pin) | Perpendicular to open | 20–60 mm | Angular pin or hydraulic | | Lifter | Angled (core pull) | 5–20 mm | Ejector plate + angle pin | | Collapsible core | Inward radial | Large (threads) | Mechanical / hydraulic |

Use mold flow simulation for precise cavity dimension offsets. injection mold design guide

Small channels (vents) must be ground into the mold to let trapped air escape, preventing "burn marks" on the final part. Core Design Guidelines at a Glance Recommended Standard Why it Matters Wall Thickness 1.0mm – 3.0mm Prevents sink and warping Draft Angle 1° (standard), 3°+ (textured) Enables clean ejection Rib Thickness Wall Thickness Prevents visible marks on exterior Radius/Corners Reduces stress concentrations Best Injection Mold Design Engineering Books Guide | Feature | Movement direction | Max stroke

Not all molds are built equally. The SPI (Society of the Plastics Industry) classifies molds by lifespan. The SPI (Society of the Plastics Industry) classifies