Modeling the Pinch-Off Zone for the Handle of a Plastic Bottle via Extrusion Blow Molding Process: An Examination of Weld-Line Quality

The extrusion blow molding (EBM) process employed in manufacturing plastic bottles necessitates a robust weld line at the pinch-off zone to ensure the durability of the final products. However, manually configuring this aspect via machine settings is often impracticable. This study seeks to address this challenge by modeling the pinch-off zone and simulating weld-line formation. Leveraging finite element analysis, a comprehensive 3D model of the pinch-off zone was meticulously developed. Subsequently, the model's fidelity was validated through experimental validation. Furthermore, simulations were conducted with varied key process parameters, including flash pocket characteristics, aiming to gauge their respective impacts on weld-line continuity. The findings of these simulations were instrumental in identifying critical factors influencing weld-line quality. This study represents a significant advancement in the manufacturing of high-quality plastic bottles, offering a precise approach to model and simulate critical weld-line regions, thereby facilitating the evaluation and enhancement of weld-line quality.