TAGUCHI-BASED ANALYSIS OF THE EFFECTS OF INJECTION MOLDING PARAMETERS ON DIMENSIONAL SHRINKAGE IN VIRGIN, RECYCLED, AND HYBRID POLYPROPYLENE COMPOSITES
24th International Istanbul Scientific Research Congress on Life, Architecture, and Mathematical Sciences, İstanbul, Türkiye, 20 - 22 Şubat 2026, ss.386-388, (Özet Bildiri)
- Yayın Türü: Bildiri / Özet Bildiri
- Doi Numarası: 10.30546/19023.978-9952-610-30-7.2025.5095
- Basıldığı Şehir: İstanbul
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.386-388
- Dokuz Eylül Üniversitesi Adresli: Evet
Özet
In this study, the effects of injection molding parameters on the dimensional shrinkage behavior of virgin (vPP30GF), recycled (rPP30GF), and hybrid (hPP12GF12T) polypropylene composite materials were experimentally investigated. A Taguchi design of experiments (DoE) approach was adopted, and an L4 orthogonal array was employed. Injection temperature (200–230 °C), injection pressure (60–80 bar), and holding/packing pressure (50–60 bar) were selected as control factors. Shrinkage in both the flow direction (FD) and the transverse-to-flow direction (TD) was evaluated using signal-to-noise (S/N) ratios and analysis of variance (ANOVA). The results indicate that holding/packing pressure is the most dominant parameter governing transverse shrinkage for all material groups in the investigated part. In terms of dimensional stability, the hybrid composite containing 12% glass fiber and 12% talc exhibited the most stable behavior, showing the lowest FD–TD shrinkage difference (0.13%), attributed to the anisotropy-reducing effect of the mineral filler. Conversely, the recycled composite demonstrated the highest dimensional deviation and the greatest sensitivity to process parameters. Overall, the study highlights the need for material-specific parameter optimization that accounts for the material’s thermal history and fiber dispersion to enable sustainable and cost-effective manufacturing.