Mold Parting Line Design

Parting Line Types

• Flat PL - Single plane, simplest, lowest cost
• Stepped PL - Multiple planes, for complex part shapes
• Contoured PL - Follows part geometry, minimizes side actions
• Tapered PL - Angled, for deep draw parts

Design Considerations

• Keep PL on a single plane where possible
• Avoid placing PL on cosmetic surfaces
• Stepped PL requires side locking for mold alignment
• Consider shut-off forces on contoured PL areas