Publication: An experimental study on fluid- structure interaction of bubbles in the blown film process
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Date
2025-08
Authors
Nur Yasmin Qhairiesha binti Kamarul Asri
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Abstract
The study presents an experimental investigation on the fluid-structure interaction (FSI) of the bubbles within the blown film extrusion process, with a particular focus on the bubble dynamics. The main goal is to comprehend the complex interaction between the molten polymer and the expanding air bubble. Key objectives include simulating airflow forces that affect bubble expansion and cooling. Next, to evaluate heat transfer effect and mechanical properties through experimental study. It will also investigate the effect of process parameters such as blower speed and air compressor angle on bubble behaviour and film quality. High-Density Polyethylene (HDPE) are used in the study. Recycled HDPEs are methodically added to a mixing ratio of 9:1, 8:2 and 7:3 (HDPE: Recycled HDPE). Blown film extrusion, compression moulding, and several characterization methods such as FTIR Spectroscopy, Tensile Testing (ASTM D882), Thermal Imaging, Cone and Plate Rheometer and Differential Scanning Calorimetry (DSC) are all a part of the process. Results show that thermal and oxidative degradation during recycling has causes inherent property being compromised in recycled HDPE. It shows lower melting temperature, decrease in crystalline and changed in rheological behavior. Obtained more complex viscosity and increased in viscous dissipation as compared to HDPE. It was discussed that process variable such as blower speed and air compressor angle had a significant impact on the final film thickness, lay-flat width, bubble stability and cooling efficiency. For applications like plastic bags, the 8:2 mixing ratio provides to be an ideal choice for mixing ratio for sustainable materials and functionality.