On the Residual Stress and Shrinkage in Injection Compression Molding
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W.-B. Young
Abstract
Injection compression molding is a process having a compression action in the filling or postfilling stages. This process is suitable for molding of parts with precision features. The success of an injection compression molding process relies on proper design of the mold and selection of process conditions. The main scope of this study is to develop an analysis tool for the residual stresses and shrinkage of an injection compression molding process. A simple thermoviscoelastic model was used to calculate the stress and relaxation developed in the postfilling stage. The model divides the thickness into two regions, glassy and rubbery phases. Residual stress calculation is applied in the glassy region, while the rubbery region is kept at the melt pressure without any strain because of the fast relaxation in this region. The resulted in-mold stress fields are used to calculate the part shrinkage after demolding. The effects of the compression force on the residual stresses and shrinkage of a molding part were also investigated. Higher compression force tends to reduce the part shrinkage but induces a higher level of residual stresses.
© 2003, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
- Screw Extrusion
- Modeling and Analysis of Helicoidal Flow in a Conical Extruder
- A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
- Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
- Mixing and Compounding
- Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
- Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
- Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
- Reactive Extrusion
- Flow Effects on Polymer Transesterification
- A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
- Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
- Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
- Die Extrusion
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Molding
- On the Residual Stress and Shrinkage in Injection Compression Molding
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
- Screw Extrusion
- Modeling and Analysis of Helicoidal Flow in a Conical Extruder
- A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
- Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
- Mixing and Compounding
- Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
- Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
- Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
- Reactive Extrusion
- Flow Effects on Polymer Transesterification
- A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
- Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
- Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
- Die Extrusion
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Molding
- On the Residual Stress and Shrinkage in Injection Compression Molding
