Two distinct cavity inserts form individual product components, while the two core inserts maintain identical geometry.

The cavity side must rotate 180 degrees concentrically and achieve precise alignment with the core.

Verify machine specifications including maximum/minimum mold height, ejector pin spacing, and clamping force during design.

Three-plate tooling requires self-ejecting nozzle systems, with special attention to reliable ejection of flexible material nozzles.

Design clearance reliefs in the second-shot cavity to prevent damage to the first-shot component. Rigorously evaluate shutoff area integrity to avoid flash risks under high injection pressure.

Slightly oversize the first-shot component to ensure tight cavity registration during the second injection, enhancing sealing effectiveness.

Prevent melt flow from displacing the first-shot component during the second injection, which could cause dimensional distortion.

Implement balanced and uniform cooling channel layouts for both cavities and cores.

Given the deformation risks of flexible materials, 99% of applications involve molding rigid components first followed by flexible overmolding.

Optimize material adhesion through compatible resin selection (e.g., specialized TPU grades) and controlled mold surface finishes - smoother surfaces enhance bond strength.