Multi-Layer Counter-Pressure Injection Molding for Thick-Walled Optical Lens
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Y. Liu
Abstract
In precision optical applications, plastics thick-walled optical lenses are increasing. Dimensional stability and optical performance are the critical issues that should be addressed for plastic thick-walled lenses. A novel multi-layer counter-pressure injection molding process is proposed in this study. The experimental prism mold with moveable pistons was developed to investigate the effects of layering methods, counter-pressure and their combination on thick-walled optical lenses. The experimental results reveal that counter-pressure injection molding is effective in improving shrinkage, transmittance and refractive index of the thick-walled optical prism. Counter-pressure of the piston provided lower melt velocity and shorter flow path of melt to improve polymer molecules orientation, and also offered continuous holding pressure during the filling stage to eliminate defects such as shrinkage or short shots. The combination of counter-pressure and multi-layer injection molding technology further improved the dimension stability and optical performance of the thick-walled optical lens. Much thinner layers than the final wall thickness of prism ensures shrinkage reduction during the cooling stages. A thick-walled optical prism was fabricated successfully upon applying a multi-layer counter-pressure injection molding process.
Acknowledgements
This study is supported by the National Key Research and Development Program of China (2019YFC1906105), the Science and Technology Major Project of Ningbo (2018B10021, 2018B10082), and the Fundamental Research Funds for the Central Universities (XK1802-3, 2312017BHYC04A).
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© 2021 Walter de Gruyter GmbH, Berlin/Boston, Germany
Artikel in diesem Heft
- Frontmatter
- Review Article
- Extraction, Treatment and Applications of Natural Fibers for Bio-Composites – A Critical Review
- Regular Contributed Articles
- Multi-Layer Counter-Pressure Injection Molding for Thick-Walled Optical Lens
- Enhancing the Thermal and Mechanical Characteristics of Polyvinyl Alcohol (PVA)-Hemp Protein Particles (HPP) Composites
- A Comparative Fatigue Analysis of GFRP, CFRP and Structural Steel for Connecting Rod Using ANSYS
- Morphological and Mechanical Properties of Thermoplastic Elastomers Based on Recycled High Density Polyethylene and Recycled Natural Rubber
- Design and Preparation of Magnetism-Driven Intelligent Hydrogel Actuators
- Synthesis of a Flame Retardant for Epoxy Resins: Thermal Stability, Flame Retardancy, and Flame-Retardant Modes
- New Approach to Melt Pressure Determination during Screw Channel Flow
- Effect of Basalt Intraply Fiber Hybridization on the Compression Behavior of Filament Wound Composite Pipes
- Assessment of Impact Energy, Wear Behavior, Thermal Resistance and Water Absorption Properties of Hybrid Bagasse Fiber/CaCO3 Reinforced Polypropylene Composites
- Multilevel Analysis of Strain Rate Effect on Visco-Damage Evolution in Short Random Fiber Reinforced Polymer Composites
- The Effect of the Compounding Procedure on the Morphology and Mechanical Properties of PLA/PBAT-Based Nanocomposites
- PPS News
- Seikei-kakou abstracts
- PPS Membership application
Artikel in diesem Heft
- Frontmatter
- Review Article
- Extraction, Treatment and Applications of Natural Fibers for Bio-Composites – A Critical Review
- Regular Contributed Articles
- Multi-Layer Counter-Pressure Injection Molding for Thick-Walled Optical Lens
- Enhancing the Thermal and Mechanical Characteristics of Polyvinyl Alcohol (PVA)-Hemp Protein Particles (HPP) Composites
- A Comparative Fatigue Analysis of GFRP, CFRP and Structural Steel for Connecting Rod Using ANSYS
- Morphological and Mechanical Properties of Thermoplastic Elastomers Based on Recycled High Density Polyethylene and Recycled Natural Rubber
- Design and Preparation of Magnetism-Driven Intelligent Hydrogel Actuators
- Synthesis of a Flame Retardant for Epoxy Resins: Thermal Stability, Flame Retardancy, and Flame-Retardant Modes
- New Approach to Melt Pressure Determination during Screw Channel Flow
- Effect of Basalt Intraply Fiber Hybridization on the Compression Behavior of Filament Wound Composite Pipes
- Assessment of Impact Energy, Wear Behavior, Thermal Resistance and Water Absorption Properties of Hybrid Bagasse Fiber/CaCO3 Reinforced Polypropylene Composites
- Multilevel Analysis of Strain Rate Effect on Visco-Damage Evolution in Short Random Fiber Reinforced Polymer Composites
- The Effect of the Compounding Procedure on the Morphology and Mechanical Properties of PLA/PBAT-Based Nanocomposites
- PPS News
- Seikei-kakou abstracts
- PPS Membership application
