When designing parts for plastic injection molding, applying draft (or a taper) to the faces of the part is critical to improving the moldability of your part. Without it, parts run the risk of poor cosmetic finishes, and may bend, break or warp due to molding stresses caused by the plastic cooling.
Equally important, an absence of draft may prevent parts from ejecting from the mold, damaging not only the parts, but possibly the mold itself — a costly and time-consuming detour.
In this month’s design tip, learn how to improve the moldability of your plastic parts by:
- drafting early and often
- sticking to the rules of draft
- factoring in surface finish
- implementing the core-cavity approach
- leveraging design for manufacturability analysis