Effects of ultrasonic injection molding conditions on the plate processing characteristics of PMMA
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Yi-Jen Yang
und
Chung-Ching Huang
Abstract
Polymer processing is a crucial and diverse field in the manufacturing industry. We investigated the process characteristics and effects of injection molding using ultrasonic vibration. An ultrasonic device was installed in an injection mold; polymer was directly vibrated during injection. An ultrasonic oscillation device 45 mm in diameter was placed in the cavity and used to vibrate a poly(methyl methacrylate) melt at 19 kHz. The amplitude of the acoustic unit was set at 15 μm for the measurements. Moreover, cavity pressure sensors were positioned at the front and rear sides of the vibration region to determine the melt flow behavior under ultrasonic-assisted injection molding conditions. Because of the absorption of ultrasonic energy, local heat was generated inside the resin, thus improving the flow characteristics of the melt. Moreover, the melt flow behavior around the skin layer was changed; the molecular orientation and high shear effect were reduced. Furthermore, the freezing rate of the melt was reduced; thus, the amount of melt pressure lost through the cavity was decreased and the residual stress inside the injection-molded component generated during the photoelastic stress analysis was lower.
Acknowledgments
We thank the National Science Council of Taiwan for funding this study.
References
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Material properties
- Structure mediation and ductility enhancement of poly(l-lactide) by random copolymer poly(d-lactide-co-ε-caprolactone)
- Morphological characterization, thermal, and mechanical properties of compatibilized high density polyethylene/polystyrene/organobentonite ternary nanocomposites
- Preparation and assembly
- Simultaneous toughening and reinforcing of cyanate ester/benzoxazine resins with improved mechanical and thermal properties by using hyperbranched polyesters
- Surface modification of Sb-SnO2/potassium titanate composite and their performance for acrylic coatings
- Poly (vinyl alcohol)/nano-diamond composite films and hydrogels prepared by gamma ray
- Engineering and processing
- Study on structures and properties of ultra-hot drawing UHMWPE fibers fabricated via dry spinning method
- Separation of CO2/CH4 and O2/N2 by polysulfone hollow fiber membranes: effects of membrane support properties and surface coating materials
- Electric field-induced alignment of MWCNTs during the processing of PP/MWCNT composites: effects on electrical, dielectric, and rheological properties
- A molecular modeling study for miscibility of polyimide/polythene mixing systems with/without compatibilizer
- Analysis and quantitative estimation of phenolic antioxidants in polypropylene packaging for fat products
- Effects of ultrasonic injection molding conditions on the plate processing characteristics of PMMA
Artikel in diesem Heft
- Frontmatter
- Material properties
- Structure mediation and ductility enhancement of poly(l-lactide) by random copolymer poly(d-lactide-co-ε-caprolactone)
- Morphological characterization, thermal, and mechanical properties of compatibilized high density polyethylene/polystyrene/organobentonite ternary nanocomposites
- Preparation and assembly
- Simultaneous toughening and reinforcing of cyanate ester/benzoxazine resins with improved mechanical and thermal properties by using hyperbranched polyesters
- Surface modification of Sb-SnO2/potassium titanate composite and their performance for acrylic coatings
- Poly (vinyl alcohol)/nano-diamond composite films and hydrogels prepared by gamma ray
- Engineering and processing
- Study on structures and properties of ultra-hot drawing UHMWPE fibers fabricated via dry spinning method
- Separation of CO2/CH4 and O2/N2 by polysulfone hollow fiber membranes: effects of membrane support properties and surface coating materials
- Electric field-induced alignment of MWCNTs during the processing of PP/MWCNT composites: effects on electrical, dielectric, and rheological properties
- A molecular modeling study for miscibility of polyimide/polythene mixing systems with/without compatibilizer
- Analysis and quantitative estimation of phenolic antioxidants in polypropylene packaging for fat products
- Effects of ultrasonic injection molding conditions on the plate processing characteristics of PMMA
