Evaluation on the Sip along the Mold in Blow Molding

摘要

It is well known that the slip behavior between molds and parison in blow molding process affects the deformation and thickness of parison complicatedly. Some reports based on the experiment results show that process condition such as temperature, blowing pressure, mold surface, and parison material have important rules on the slip behavior. But it is difficult to distinguish the effect of each process condition and material behavior on the slip appropriately. In the previous study, the author's performed numerical investigation of thermoforming considering the slip effect. The simulations were conducted during in the full slip and full stick condition. Simulation results in the report explains a general tendency of the slip, but locally there are some parts of the layer which showed different tendency compared with the experiments. In order to investigate further, we need to describe the physical meaning of the slip model. In this report, we attempt to describe the physical meaning of the slip and performed qualitative prediction by using a simple model. Slip along the wall is defined as temperature and contact velocity function. The relationship between this function and its physical meaning is being investigated and important results have not been appeared yet. This study is still undergone, but intermediate results are reported.