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Manufacturing Products
Published in Roger Timings, Basic Manufacturing, 2006
Extrusion moulding consists of the continuous ejection, under pressure, of heated thermoplastic material through a die orifice to produce long lengths of formed plastic strip, for example, curtain rail strip. The principle of the process is shown in Fig. 3.27.
Enhancing thermal conductivity and balancing mechanical properties of 3D-printed iPP/HDPE-based dielectric composites via the introduction of hybrid fillers and tailored crystalline structure
Published in Virtual and Physical Prototyping, 2023
Tao Yang, Jie Leng, Jiewei Hu, Pengbo Wang, Mariya Edeleva, Ludwig Cardon, Zheng Yan, Tao Wang, Jie Zhang
Studies have shown that assembling conductive fillers with different sizes and morphologies benefits the thermal conductivity and mechanical properties improvement for synergistic enhancement effect. (Han, Ruan, and Gu 2022; Hu et al. 2017; Ohnmacht et al. 2023; Zhu et al. 2019). For example, the improved thermal transport and mechanical performance were achieved by polyvinyl alcohol (PVA) composites with SiO2 nanoparticles-modified-exfoliated hexagonal boron nitride (h-BN) (Zhang et al. 2019). The use of hybrid fillers also leads to the improve of dielectric properties (Lim et al. 2022; Shi et al. 2021; Wondu, Lule, and Kim 2021). For example, increased thermal conductivity value and better dielectric properties were obtained by combining multiwalled carbon nanotubes (MWCNTs) and zinc oxide (ZnO) for PP-based composites (Russo et al. 2018). In addition, filler orientation through magnetic alignment (Lin et al. 2013), electric field alignment (Uetani et al. 2014) and shear alignment (Song et al. 2012; Wieme et al. 2022; Yang et al. 2011), etc. can be beneficial. According to this approach, the composites could gain enhanced TC for heat conduction paths construction with low filler content (Zhang, Feng, and Feng 2020). Among the filler orientation methods, shear alignment is attractive due to a wider selection of filler types and the widespread of the shear phenomenon which exists in most manufacturing process (e.g. injection moulding and extrusion moulding, etc.). However, this method has some limitations in forming functional composites with oriented fillers because it restricts the filler orientation direction and cannot be easily customised.