Effect of process parameters on the optical properties of cast polypropylene film

Mohamad Yusof, Nur Izzati (2020) Effect of process parameters on the optical properties of cast polypropylene film. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Cast Polypropylene (CPP) film is widely known for its best properties in mechanical, physical, and optical aspects especially for its high gloss, clarity, and transparency, leading it to be generally used as packaging film. In this study, the CPP films manufactured by San Miguel Yamamura Plastic Film Sdn. Bhd. (SMYPF) cast co-extrusion process were suffering from two types of defect: (i) the presence oforange peel features on film surface and (ii) variation in film layer thickness. Hence, this project investigated on the effect of processing parameters such as extrusion temperature and feed block thickness rate on the transparency and thickness variation issue of the CPP films, respectively. For orange peel defect, scanning electron microscopy (SEM) was used to examine the film surface morphology as a function of melt temperature; and the film surface roughness measurement was supplemented using atomic force microscopy (AFM) technique. Meanwhile, the cross-sectional thickness of the film was studied post feed block adjustment using SEM. The result showed that orange peel features can be minimized by adjusted the melt temperature at the last zone of extruder as the increase in melt temperature resulted in the drop of polymer melt viscosity, leading to higher shear rate at the die exit. On the other hand, thickness variation problem was successfully mitigated by increasing the feed block at the extruder to allow more material throughput and subsequently increased the film skin layer thickness.

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