Numerical Analysis and Evaluation of Process and Geometry Specific Transient Temperature Fields for a New Variation of Gas-Assisted Injection Molding
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E. Moritzer
und S. Seidel
Abstract
Two-Stage GITBlow, a special injection molding process developed by Polymer Processing Paderborn, combines the advantages of gas-assisted injection molding and blow molding. This is achieved by producing a preform with gas-assisted injection molding, which is then inflated into a larger cavity in the same mold. The inflation behavior is heavily influenced by the temperature distribution over the cross section of the preform. The preform is not rotationally symmetric and features functional geometries that are not inflated during the second process stage. Therefore, the temperature development during the first stage, i.e. the gas-assisted injection molding, as well as cooling and handling of the preform, is essential for the subsequent inflation. If certain thermal conditions are met, inflation and the creation of a homogeneous wall thickness is improved. The development of the necessary temperature profiles for homogeneous inflation is heavily dependent on the geometry of the gas chamber. Due to the preform's geometry, characteristic material accumulations are formed during the gas injection. These create local temperature hotspots that act as heat sources during the temperature equalization before inflation starts. Simulations were conducted to predict the gas chamber geometry and its influence on the temperature distribution and development during the process. The combination of two different simulation approaches creates a new method to analyze GITBlow and similar processes. Simulation results were verified with extensive experimental studies.
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Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Multilayer Coextrusion of Polymer Composites to Develop Organic Capacitors
- Heat Flow Analysis and Efficiency Optimization of Rotational Molding Equipment for Large Plastic Products
- Thermorheology of Polyethylene Wax Modified Sulfur Asphalt
- Thermoplastic Cellulose Stearate and Cellulose Laurate: Melt Rheology, Processing and Application Potential
- Crystallization Kinetics for PP/EPDM/Nano-CaCO3 Composites – The Influence of Nanoparticles Distribution
- The Effect of ZnO Nanoparticle Filler on the Attenuation of ZnO/PCL Nanocomposites Using Microstrip Line at Microwave Frequency
- Synthesis and Properties of Nitrogen Heterocycle-Functionalized Core-Shell Hyperbranched Polyester
- Morphology Tuning of Conducting Polyaniline via Static, Liquid-Liquid Interfacial Polymerization Process and its Application for Optical pH Sensing
- Tuning of Final Performances of Soybean Oil–Based Polymer Nanocomposites: Effect of Styryl/Oil Functionalized Intercalant of Montmorillonite Reinforcer
- Processability, Thermal and Mechanical Properties of Rigid PVC/Kaolin Coated with Liquid Macromolecular Modifier Composites
- Numerical Analysis and Evaluation of Process and Geometry Specific Transient Temperature Fields for a New Variation of Gas-Assisted Injection Molding
- Effect of Feeding Strategy on the Properties of PP/Recycled EPDM Blends
- Analysis of a Single Screw Extruder with a Grooved Plasticating Barrel – Part I: The Melting Model
- Melt Elongation Strength and Drawability of LDPE/LLDPE Blends
- PPS News
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