TY - THES

T1 - Investigation of the influence of speed increase in pultrusion by means of design of experiment on the barrier properties of glass fiber reinforced polyester profiles.

AU - Ekam, Maximilian

N1 - embargoed until 28-07-2028

PY - 2023

Y1 - 2023

N2 - Pultrusion is the only truly continuous composite manufacturing process. Due to the high degree of automation, an increase in productivity by increasing speed is possible and profitable without increasing variable personnel costs. Most studies on speed increases vary the speed independently of the temperature, thus the undercured profiles show inferior properties. The aim of this work is to investigate whether an increase of the speed with an accompanied increase of the temperature has an influence on the barrier properties. The profile that is the subject of this study is made of isophthalic polyester resin reinforced with a glass fiber structure and acts as the body of a lamp. Impending supply chain problems and severe wear on the mold have necessitated the testing of a new resin and the replacement of titanium dioxide with calcium carbonate. Due to poor performance in impact testing, the effectiveness of a more ductile resin and an increase in the fiber volume content were additionally investigated. These diverse objectives and unclear cause-effect relationships led to the implementation of a full factorial design of experiment. Here, the influence of speed with simultaneous temperature adjustment, three different resin systems, and an increase in fiber volume content is tested on the barrier properties and the processing behavior. The evaluation of the results has shown that if the increase in speed affects the tested barrier properties, then only negatively. The change of the resin system is beneficial for some properties. The increase of the fiber volume content is suspected to have no significant influence.

AB - Pultrusion is the only truly continuous composite manufacturing process. Due to the high degree of automation, an increase in productivity by increasing speed is possible and profitable without increasing variable personnel costs. Most studies on speed increases vary the speed independently of the temperature, thus the undercured profiles show inferior properties. The aim of this work is to investigate whether an increase of the speed with an accompanied increase of the temperature has an influence on the barrier properties. The profile that is the subject of this study is made of isophthalic polyester resin reinforced with a glass fiber structure and acts as the body of a lamp. Impending supply chain problems and severe wear on the mold have necessitated the testing of a new resin and the replacement of titanium dioxide with calcium carbonate. Due to poor performance in impact testing, the effectiveness of a more ductile resin and an increase in the fiber volume content were additionally investigated. These diverse objectives and unclear cause-effect relationships led to the implementation of a full factorial design of experiment. Here, the influence of speed with simultaneous temperature adjustment, three different resin systems, and an increase in fiber volume content is tested on the barrier properties and the processing behavior. The evaluation of the results has shown that if the increase in speed affects the tested barrier properties, then only negatively. The change of the resin system is beneficial for some properties. The increase of the fiber volume content is suspected to have no significant influence.

KW - Pultrusion

KW - Verbundwerkstoff

KW - Produktivität

KW - Versuchsplanung

KW - Polyesterharz

KW - Glasfasern

KW - Geschwindigkeitserhöhung

KW - Barriereeigenschaft

KW - pultrusion

KW - composite

KW - high speed

KW - unsaturated polyester resin

KW - glass fiber

KW - processing

KW - design of experiment

KW - barrier property

KW - impact

U2 - 10.34901/mul.pub.2023.254

DO - 10.34901/mul.pub.2023.254

M3 - Master's Thesis

ER -