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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Published on: April 19, 2018

Innovative Blown Multi-Micro-Nano-Layer Coextrusion: Insights into Rheology and Process Stability.

Lazaros Vozikis^1,2, Skander Mani², Abderrahim Maazouz¹

¹CNRS, UMR 5223, Ingénierie des Matériaux Polymères, INSA Lyon, Université de Lyon, F-69621 Villeurbanne, France.

|January 11, 2025

Summary

This study presents a novel blown coextrusion die for producing high-layer-count films efficiently. The technology enhances material use and recyclability without compromising layer integrity or increasing processing time.

Keywords:

blown coextrusion morphology multi-micro-nano-layer films shear and extensional rheology stability investigation

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Area of Science:

Polymer Science and Engineering
Materials Science
Chemical Engineering

Background:

Conventional multilayer film production faces limitations in layer count and material efficiency.
Achieving high layer counts often requires complex die designs and can increase processing time, risking thermal degradation.
There is a need for advanced extrusion die technologies to improve film properties and sustainability.

Purpose of the Study:

To introduce and evaluate an innovative blown coextrusion die technology.
To demonstrate the capability of producing micro- and nano-scale multilayer films with high layer integrity.
To assess the potential for enhanced material efficiency and improved recyclability in film production.

Main Methods:

Development of a novel blown coextrusion die without multiplier elements.
Integration with existing cast coextrusion technologies.
Rheological analysis and development of stability maps to determine optimal processing windows.

Main Results:

The novel die enables a high number of layers without extending residence time, minimizing thermal degradation risk.
Films with excellent layer adhesion were produced without the need for tie layers.
Optimal processing windows were identified through stability maps and rheological analysis.

Conclusions:

The developed blown coextrusion die technology offers a versatile solution for producing advanced multilayer films.
This innovation enhances material efficiency, reduces reliance on barrier materials like EVOH, and improves recyclability.
The technology supports sustainability goals by enabling the production of high-performance films with improved end-of-life options.