A robust shock and noise model for the manufacturing of molded LDPE foams

The article concerns the injection manufacturing process of molded foam sheets and their intrinsic shock and noise performances. The main goal is to optimize the physical performances of molded plastic foams at an early stage in their design and manufacturing. The effects of injection process parameters on the properties of molded LDPE foams are investigated. The input optimization parameters considered are: injection temperature, mold temperature, injection speed, plasticization back pressure, and screw rotation speed during the plasticization phase. The output optimization parameters considered are: density, shock absorption, and acoustic absorption. The experimental design method made use of the Taguchi table and central composition design. This allows us to identify simplified mathematical models for input/output and to detect the most influential input in the injection process. We conclude by validating the models and their robustness. POLYM. ENG. SCI., 48:2305-2316, 2008. [C] 2008 Society of Plastics Engineers
INTRODUCTION Plastic foams are made up of scattered cavities. These cavities enhance lightness and softness, while adding to the soundproofing and heatproofing qualities. Polymer foams are increasingly used in industrial [...]