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Sonniger Start in das neue Semester (April 2023). Bildinformationen anzeigen

Sonniger Start in das neue Semester (April 2023).

Foto: Universität Paderborn, Besim Mazhiqi

Felix Flachmann, M.Sc.

Kontakt
Publikationen
 Felix Flachmann, M.Sc.

Kunststofftechnologie und Kunststoffverarbeitung

Wissenschaftlicher Mitarbeiter - Spritzgießen & FVK

Institut für Leichtbau mit Hybridsystemen (ILH)

Mitglied - Wissenschaftlicher Mitarbeiter - ILH Beauftragter der Kunststofftechnik Paderborn

Telefon:
+49 5251 60-3270
Büro:
P1.2.11.2
Besucher:
Pohlweg 47-49
33098 Paderborn

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2023

Morphological and mechanical properties of foamed thick-walled Wood-Plastic-Composite structures

E. Moritzer, F. Flachmann, Journal of Cellular Plastics (2023), 59(3), pp. 187-199

<jats:p> Microcellular wood fiber reinforced polymers offer the possibility to reduce the use of fossil raw materials. In particular, thick-walled structures with thicknesses greater than 6 mm offer a high potential for weight savings. This study investigates the cell structures and mechanical properties of injection-molded test specimens. The influence of different thicknesses (6–10 mm) along with different chemical blowing agents (endothermic, exothermic) with varying dosages (0–2 wt%) is analyzed. The investigations reveal that exothermic chemical blowing agents form finer cells consistently to thin-walled structures than endothermic ones. Higher foaming agent content leads to higher pore fractions, with many small cells coalescing into a large open-pore cell network. The mechanical properties depend mainly on the pore content of the sample. The specific tensile properties deteriorate with the use of chemical blowing agents (CFA), whereas the sandwich structure produced with compact edge layers has a positive influence on the specific flexural properties. </jats:p>


Morphological and mechanical properties of foamed thick-walled Wood-Plastic-Composite structures

E. Moritzer, F. Flachmann, Journal of Cellular Plastics (2023), 187, pp. 187-199


2022

Verbessertes Füllverhalten im Spritzgießprozess durch Schäumen von WPC: Bewertung des Fließverhaltens treibmittelbeladener Polymerschmelzen

A. Fuhrmann, R.. Schoch, A. Rusam, M. Bosse, F. Flachmann, E. Moritzer, T. Hochrein, M. Bastian, Shaker, 2022


Analysis of the Segregation Phenomena of Wood Fiber Reinforced Plastics

E. Moritzer, F. Flachmann, M. Richters, M. Neugebauer, Journal of Composites Science (2022), 6(10), 321

<jats:p>Wood–plastic composites (WPC) are enjoying a steady increase in popularity. In addition to the extrusion of decking boards, the material is also used increasingly in injection molding. Depending on the formulation, geometry and process parameters, WPC tends to exhibit irregular filling behavior, similar to the processing of thermosets. In this work, the influence of matrix material and wood fiber content on the flow, mold filling and segregation behavior of WPC is analyzed. For this purpose, investigations were carried out on a flow spiral and a sheet cavity. WPC based on thermoplastic polyurethane (TPU) achieves significantly higher flow path lengths at a wood mass content of 30% than polypropylene (PP)-based WPC. The opposite behavior occurs at higher wood contents due to the different shear thinning behavior. Slightly decreased wood contents could be observed at the beginning of the flow path and greatly increased wood contents at the end of the flow path, compared to the starting material. When using the plate cavity, flow anomalies in the form of free jets occur as a function of the wood content, with TPU exhibiting the more critical behavior. The flow front is frayed, but in contrast to the flow spiral, no significant wood accumulation could be detected due to the shorter flow path lengths.</jats:p>


Analysis of the Segregation Phenomena of Wood Fiber Reinforced Plastics

E. Moritzer, F. Flachmann, M. Richters, M. Neugebauer, Journal of Composites Science (2022)


2021

Die Fließfront darf nicht brechen

E. Moritzer, F. Flachmann, Kunststoffe (2021), 12, pp. 42-44


Influence of Chemical Blowing Agents on the Filling Behavior of Wood-Plastic-Composite Melts

E. Moritzer, F. Flachmann, in: SPE ANTEC 2021: The Annual Technical Conference for Plastic Professionals, 2021, pp. 536-540


Process-reliable Injection Molding of Highly Filled Wood-Plastic-Composites (WPC)

E. Moritzer, F. Flachmann, in: PPS-36 Proceedings, 2021


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