Molded Pulp Mold Design and CAD: Turning Product Geometry Into Formable Tooling

Mold design determines whether a molded pulp part forms cleanly, releases without tearing, and holds tolerance. CAD is used to add draft angles (typically 1.5–3 degrees), wall thickness, drainage holes, and screen mesh to the tool. These details control fiber distribution, drainage, and demolding, directly affecting part strength and surface finish.

The Scenario: Designing formable tooling

Mold design faces three challenges:

Pain Points

• Without proper draft angles, parts tear or stick during demolding, causing rejects;
• Uneven fiber distribution and drainage create weak spots and long cycle times;
• Tolerance and surface finish depend on screen mesh and geometry decisions made in CAD.

The Solution: Three mold-design solutions

CAD-driven mold design solves three problems:

1. Draft-angle and release geometry Adding 1.5–3 degree draft angles lets parts release cleanly without tearing.

2. Fiber-distribution and drainage design Wall thickness, drainage holes, and screen mesh are tuned in CAD for even fiber and fast dewatering.

3. Tolerance and finish control Geometry and mesh choices set the dimensional tolerance and surface finish of the finished part.

The Result: Tooling that forms cleanly

With this design approach, molds form parts cleanly, release reliably, and hold tolerance — cutting rejects and cycle time from day one.