In this study, numerical simulation is used to analyze the blow molding process of an automotive fuel tank. In a first step, 3D simulations employing a shell approximation are used to investigate the deformation of a multi-layer parison as well as the thickness variation for each layer. Next, 2D simulations are used to study the details of the welding line formation. Locally, the shear flow across the parison thickness can no longer be neglected. The position of the interface between the layers is calculated using adaptive meshing to handle the very large deformations. The influence of the rheology on the position of the interface is investigated.
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