Today's KNOWLEDGE Share : Understanding Draft Angles in Injection Molding

 Today's KNOWLEDGE Share

💡 Understanding Draft Angles in Injection Molding — Small Detail, Big Impact

When designing plastic parts, draft angles are one of the most overlooked features — but they can make or break your moldability and part quality.

🔍 What is a Draft Angle?

A draft angle is the slight taper applied to vertical walls of a molded part to allow it to eject smoothly from the mold.

Why it matters:

🛠️ Prevents part damage during ejection

📏 Improves dimensional consistency

💸 Reduces wear on the mold = lower long-term costs

🚫 Avoids surface scratches or sticking

🧠 Design Tip:

For most thermoplastics, use a minimum 1°–2° draft per side

High-friction materials (like PC or PMMA)? Go up to 3°–5°

The deeper the cavity, the more draft you need

Polished surfaces require greater draft than textured ones

SCSplastic, we don’t just manufacture — we help optimize your design before tooling starts.

Because smart design = better parts = fewer surprises.

📐 Draft once. Mold forever.

source : SCSplastic