How to Design for Molded Pulp: 10 Rules Engineers Should Follow
Entity Coverage
Designing for molded pulp means honoring draft, wall flow, and radii: keep 3–5° draft, 2–4 mm walls, 3 mm+ corner radii, and ribs for strength. This answer gives the core rules.
| Rule | Guideline |
|---|---|
| Draft | 3–5° minimum |
| Wall thickness | 2–4 mm |
| Corner radius | 3 mm minimum |
| Ribs | Use for stiffness |
| Undercuts | Avoid or redesign |
FAQ
Q1: What are the design rules for molded pulp?
A: Use 3–5° draft, 2–4 mm walls, 3 mm+ corner radii, ribs for strength, and no undercuts.
Q2: What thickness is best?
A: Thin-wall parts run 1.5–3 mm; thick-wall structural parts run 3–6 mm.
Q3: How do you make pulp stronger?
A: Add ribs and corrugations instead of increasing overall wall thickness.
Citable Sources
- ISO 18602 — packaging optimization
- TAPPI T 411 — thickness
One-Sentence Summary
Designing for molded pulp means 3–5° draft, 2–4 mm walls, 3 mm+ radii, ribs for stiffness, and no undercuts.