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Related Experiment Video

Updated: Jan 15, 2026

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

Flow-Line-Reducing Tetrahedral Metal Effect Pigments for Injection Molding: A Yield-Rate-Improved Particle

Nils Maximilian Demski^1,2, Holger Seidlitz^1,2, Felix Kuke^1,2

¹Research Division Polymeric Materials and Composites PYCO, Fraunhofer Institute for Applied Polymer Research IAP, 15745 Wildau, Germany.

|October 16, 2025

Summary

This study introduces a new method for creating tetrahedral metal effect pigment particles using UV imprint lithography. This technique avoids manufacturing issues and reduces flowlines in polymer components.

Keywords:

flowline injection molding metal effect pigment tetrahedral polymer particle weld line

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Last Updated: Jan 15, 2026

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Published on: June 27, 2014

Area of Science:

Materials Science
Polymer Chemistry
Manufacturing Engineering

Background:

Conventional platelet-shaped metal effect pigments can cause flowlines in injection-molded polymers.
Previous methods for tetrahedral aluminum particles faced manufacturing challenges like particle adhesion and high reject rates.

Purpose of the Study:

To develop an improved manufacturing method for tetrahedral metal effect pigment particles.
To overcome the limitations of previous manufacturing processes for tetrahedral pigments.
To assess the performance of novel tetrahedral particles in polymer components.

Main Methods:

A novel manufacturing technique based on UV imprint lithography was developed.
Metallized UV-cured thermoset polymer was used for the tetrahedral particles.
The novel particles were dispersed in amorphous matrix thermoplastics for injection molding tests.

Main Results:

The new UV imprint lithography method for tetrahedral particles omits reject rates seen in the cold rolling process.
The metallized polymer tetrahedral particles maintained their shape during the injection molding process.
Reduced flowlines were observed in polymer components using these novel tetrahedral particles compared to conventional ones.

Conclusions:

The novel UV imprint lithography manufacturing technique offers a viable alternative for producing tetrahedral metal effect pigments.
These new tetrahedral particles show potential for reducing defects and improving aesthetics in polymer components.
The developed manufacturing method has increased potential for future automation through roll-to-roll processing.