Injection Mold Design Guide [upd] -

The mold must be colder than the plastic (obviously), but the difference between the A side and B side temperature should be minimized. If the A side runs hot and B side cold, the part will warp.

Before a single line of the mold is drawn, the part itself must be optimized. You cannot design a good mold for a bad part. Key considerations include: injection mold design guide

The Ultimate Injection Mold Design Guide: Principles, Best Practices, and Materials The mold must be colder than the plastic

Run through this checklist before sending your mold design to the machine shop. You cannot design a good mold for a bad part

A well-designed mold operates quietly, cycles quickly (under 30 seconds), produces zero flash, and lasts for millions of cycles. A poorly designed mold causes flashing, sticking, and costly downtime.

The entry point for plastic. Common types include: Edge Gate: Standard, simple to machine.

Plastic resins shrink as they solidify. Designers must scale the mold cavity dimensions up based on the specific resin's shrinkage rate to yield a finished part with correct tolerances.