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Fluids 2019, 4(1), 23; https://doi.org/10.3390/fluids4010023

Piezo-Plunger Jetting Technology: An Experimental Study on Jetting Characteristics of Filled Epoxy Polymers

1
Fraunhofer Institute for Reliability and Microintegration (IZM), System Integration and Interconnection Technologies, Gustav-Meyer-Allee 25, D-13355 Berlin, Germany
2
Berlin Institute of Technology (TU Berlin), Polymer Engineering and Physics, Ernst-Reuter-Platz 1, D-10587 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 4 December 2018 / Revised: 10 January 2019 / Accepted: 22 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Advances in Experimental and Computational Rheology)
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Abstract

The droplet formation of Newtonian fluids and suspensions modified by spherical, non-colloidal particles has attracted much interest in practical and theoretical research. For the present study, a jetting technique was used which accelerates a geometrically defined plunger by a piezoelectric actuator. Changing rheological properties of materials and extending deformation rates towards nonlinear viscoelastic regimes created the requirement to extend dosage impulses towards larger magnitudes. To mimic the rheological characteristics of nonconductive adhesives we modified Newtonian epoxy resins by thixotropic additives and micro-scale glass spheres. Rheological analysis at steady shear and oscillatory shear ensured a differentiation between material and process-related factors. Evaluation of high-speed images allowed the investigation of drop dynamics and highlighted the dispense impulse reduction by material-specific dampening properties. View Full-Text
Keywords: complex fluids; drop formation; epoxy; jetting; polymers; polymer processing; prototyping; rheology complex fluids; drop formation; epoxy; jetting; polymers; polymer processing; prototyping; rheology
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Kurz, A.; Bauer, J.; Wagner, M. Piezo-Plunger Jetting Technology: An Experimental Study on Jetting Characteristics of Filled Epoxy Polymers. Fluids 2019, 4, 23.

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