Numerical and experimental analysis of resin-flow, heat-transfer, and cure in a resin-injection pultrusion process

Journal article (2021)

Authors

Michael Sandberg Technical University of Denmark (DTU)

O. Yuksel University of Twente

Ismet Baran University of Twente

Jesper H. Hattel Technical University of Denmark (DTU)

Jon Spangenberg Technical University of Denmark (DTU)

Affiliation

External organisation

Non-isothermal flow Liquid composite moulding Arbitrary Lagrangian–Eulerian (ALE) Polyurethane resin Resin-injection pultrusion

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Published Date

2021

Language

English

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Abstract

This paper concerns non-isothermal flow in a thermoset resin-injection pultrusion process. Supported by temperature measurements from an industrial pultrusion line and a material characterisation study (curing kinetics, chemorheology, and permeability), the material flow was analysed for the manufacture of a thick glass-fibre profile saturated with a pultrusion-specific polyurethane resin. A central finding is that the heating configuration, together with the strongly convective flow near inlets resulted in phase transitions that were both concave and convex-shaped. This is different from existing literature that commonly describes curing being initiated from die-walls, resulting in the concave phase-transitions.