Injection Mold Design Guide [better] Direct

Never assume a resin’s datasheet shrinkage value. Run a Mold Flow Analysis (MFA) to understand how geometry interacts with the specific grade.

The resin you choose dictates nearly every design rule. You cannot design a mold without specifying the material first. injection mold design guide

| Gate Type | Advantages | Disadvantages | Best Use | |-----------|------------|---------------|-----------| | | Simple, easy to trim | Visible scar | Flat parts, general purpose | | Submarine (Tunnel) | Automatic degating | Requires draft angle | High volume, small parts | | Pin Point (3-plate) | Multiple gates, balanced flow | Wastes more material | Round or symmetrical parts | | Fan Gate | Reduces jetting, low stress | Wide scar | Large, flat, warp-sensitive parts | | Diaphragm | Concentric fill, no weld lines | High pressure loss | Tubes, cylinders, gears | | Valve Gate (Hot runner) | No gate vestige, active control | Expensive, complex | Aesthetic surfaces, cleanroom | Never assume a resin’s datasheet shrinkage value