Disha Tupe,
"Injection Molding Simulations for Virgin and Recycled Polypropylene"
, 2020
Original Titel:
Injection Molding Simulations for Virgin and Recycled Polypropylene
Sprache des Titels:
Englisch
Original Kurzfassung:
eng: Injection moulding is one of the most common mass-producing processes, can produce parts of various size and shapes. Automation in processing will help to optimize the processing time and earn profits by minimizing development costs and efficient use of resources. However, some deformations such as short shot, presence of weld lines, de-moulding issues, shrinkage, warpage, affect the function, durability and aesthetics of the moulded components. Thus, tools such as injection moulding simulations are employed to predict the complex flow behaviours, phase transition, temperature and pressure dependence of the material during and after processing. To achieve a good quality component, the interrelationship between process parameters, machine operations, mould parameters, and material characteristics must be thoroughly studied. <br />This thesis deals with the material characterization of recycled of PE, PP and polyblend PE/PP and virgin PP grade. Various material characterization tests such as rheological, thermal, mechanical and physical tests are performed at Transfercenter für Kunststofftechnik, Wels. A special type of dilatometer called Pirouette - pvT apparatus is used to characterize the pvT relationship. A comparison of various material models available in simulation software (Moldex3D) and data fitting of one model each for viscosity, pvT behaviour and viscoelasticity is performed to replicate the material behaviour in simulations. <br/>This research analyzed the behaviour of virgin PP and recycled PP during and after the injection moulding process with the simulation software Moldex3D. Here the influence of material characteristics and different process settings on the warpage of the component are studied in detail. To compare the accuracy of predicted warpage results from simulations, actual moulded components with same process settings and materials are 3D scanned using the Steinbichler L3D Comet scanner by Steinbichler Optotechnik GmbH (now ZEISS Optotechnik). An open-source point data processing software CloudCompare is used to compare the warpage of 3D scanned components with simulation results.
Forschungs-