Proceedings of the 5th Bi-Annual PMI Conference vol:5 pages:224-229
Polymers and Mould Innovations Conference edition:5 location:Gent date:12-14 September 2012
Water-assisted injection molding (WAIM) is a recent and promising technique to produce hollow or partially hollow products. A shorter cycle time in combination with a lower material and process cost are the main advantages. Due to the recent development of WAIM (1998) limited research are available on the technique. This study performs both WAIM experiments and simulations at different process and material parameters. The first part of the study experimentally investigates the influence of melt temperature as well as zero-shear viscosity on the residual wall thickness (RWT) of the product. The experimental results are used in the second part in order to validate a commercial available simulation software. It was found that both melt temperature and zero-shear viscosity change polymer resistance and consequently have a significant influence on RWT. By taking into account material dependent pump losses, the simulation software is able to predict RWT and visualize the effect of both process and material parameters within a reasonable deviation.