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Updated: May 21, 2025

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars

Published on: August 4, 2018

Enabling Soft Molds for Manufacturing Polymeric Surface Structures with Overhangs.

Qingyang Sun¹, Tingyi Leo Liu^1,2

¹Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst 01003, Massachusetts, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 7, 2025

Summary

This summary is machine-generated.

This study developed a model for soft mold design to overcome manufacturing challenges with overhanging surface structures. The validated model enables high-fidelity replication of complex biomimetic surfaces for advanced applications.

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Area of Science:

Materials Science
Biomimetics
Manufacturing Engineering

Background:

Surface structures with overhangs are common in nature but difficult to manufacture due to mold interlock.
Existing soft molds face challenges with stiction and collapsing at the microscale.

Purpose of the Study:

To model the relationship between overhang geometry and material properties for robust soft mold design.
To enable high-fidelity manufacturing of complex biomimetic surfaces with hierarchical overhangs.

Main Methods:

Developed a predictive model for soft mold design considering flexibility and structural integrity.
Verified the model using polydimethylsiloxane (PDMS) molds with varying properties and geometries.
Molded doubly re-entrant surface structures using validated soft molds and thermosetting polymers.

Main Results:

The model demonstrated excellent agreement with experimental data from PDMS and literature soft molds.
Successfully replicated complex hierarchical overhang structures with high fidelity.
Achieved surfaces that repel low-energy fluids without requiring coatings.

Conclusions:

Established key design principles for soft mold fabrication to prevent interlock and enable complex overhang formation.
The findings pave the way for large-scale manufacturing of intricate biomimetic surfaces.
Demonstrated the potential for creating advanced functional surfaces for various applications.