Micro Replication by Injection-Compression Molding
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M. Rohde
Abstract
The replication of polymeric microstructures on a flat surface is not easily achieved by conventional injection molding, because of the required micro-dimensional control and the stringent tolerances of most applications. Moreover, the flow behaviour of melts in micro cavities remains not well understood and challenging. On the other hand, injection-compression molding is an established process for the manufacturing of optical storage media, like compact discs (CD) or digital versatile discs (DVD), with grooves and pits at the micro-scale. The difficulties arise mainly from two sources: lack of adequate filling because of premature freezing of features with very small thicknesses and excessive deformation during ejection due to high friction at the polymer-metal interface. In this work, a study is carried out to investigate the effect of process parameters on the replication of various microstructures on a flat disk using microinjection-compression molding. A commercial microinjection molding machine has been used in the study. Two optical grade polymers poly(methyl methacrylate) (PMMA) and cyclic olefin polymer (COP) were used in conjunction with various mold inserts to reproduce the embedded microstructures. The dimensions of the microstructures on the inserts and molded parts were measured with a confocal profiler. A transcription ratio was defined to assess the quality of the replication. The design of experiment (DOE) method was used to obtain correlations between the process parameters and the development of the microstructure during injection-compression molding.
References
Chen, C.-C. A., Kao, S.-C., “A Study of Two-stage Micro Injection Compression Molding Process for Diffractive Optical Lens”, Key Engineering Materials, 364–366, 1211–1214(2008)10.4028/www.scientific.net/KEM.364-366.1211Suche in Google Scholar
Chien, R.-D., “Micromolding of bioship Devices Designed with Microchannels”, Sensors and Actuators A: Physical, A 128, 238–247(2006)10.1016/j.sna.2006.02.029Suche in Google Scholar
Guo, J., et al., “Study of the Demolding Process – Implication of Thermal Stress, Adhesion and Friction Control”, J. Micromech. Microeng., 17, 9–19(2007)10.1088/0960-1317/17/1/002Suche in Google Scholar
Heckele, M., Schomburg, W. K., “Review on Micro Molding of Thermoplastics”, Micromech. Microeng., 14, R1–R14 (2004)10.1088/0960-1317/14/3/R01Suche in Google Scholar
Hetu, J. F., et al., “Three Dimensional Simulation of Injection Molding of Parts with Microstructures”, AICHE 2005 Annual Meeting, Cincinnati, Paper ID31792 (2005)Suche in Google Scholar
Ito, H., et al., “Development of a Novel Transcription Molding Process to Fabricate Sophisticated Polymer Products with Precise Microstructure and High Transparency Applicable to Display Devices and Bio-Chips”, Int. Polym. Proc., 22, 155–165(2006)Suche in Google Scholar
Shen, Y. K., et al., “Study on Optical Properties of Microstructure Lightguiding Plate for Micro Injection Molding and Micro Injection-Compression Molding”, Materials Science Forum Vol. 505–507, 229–234(2006)10.4028/www.scientific.net/MSF.505-507.229Suche in Google Scholar
Shen, Y. K., “Comparison of Height Replication Properties of Micro-Injection Moulding and Micro-injection-compression Moulding for Production of Microstructures on Lightguiding Plates”, Plast., Rubber Compos. Process. Appl., 36, 77–84(2007)10.1179/174328907X171244Suche in Google Scholar
Su, Y.-C., et al., “Implementation and Analysis of Polymeric Microstructure Replication by Micro Injection Molding”, J. Micromech. Microeng., 14, 415–422(2004)10.1088/0960-1317/14/3/015Suche in Google Scholar
Tofteberg, T., et al. “Injection Molding of a Diffractive Optical Element”, Polym. Eng. Sci., 48, 2134–2142(2008)10.1002/pen.21154Suche in Google Scholar
Tseng, S. C., Liao, C. L. “A Study of Processing Conditions on the Properties of Diffraction Optical Elements by Injection/Compression Molding Process”, Int. Polym. Proc., 18, 194–198(2003)Suche in Google Scholar
Turng, L.-S., “Special and Emerging Injection Molding Processes”, J. Inj. Mold. Tech., 3, 160–179(2001)Suche in Google Scholar
Wimberger-Friedl, R., et al., “Molding of Microstructures and High Aspect Ratio Features”, SPE ANTEC Tech. Papers, 539–543 (2003)Suche in Google Scholar
Wu, C.-H., Chen, W.-S., “Injection Molding and injection Compression Molding of Three-beam Grating of DVD Pickup Lens”, Sensors and Actuators A: Physical, A 125, 367–375(2006)10.1016/j.sna.2005.07.025Suche in Google Scholar
Yu, L., et al., “Flow and Heat Transfer Simulation of Thin-Wall Injection Molding with Microstructures”, SPE ANTEC, 602–606(2003)Suche in Google Scholar
Zhao, J., et al., “Effect of Process Parameters on the Micro Molding Process”, Polym. Eng. Sci., 43, 1542–1554(2003)10.1002/pen.10130Suche in Google Scholar
© 2009, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Investigation of the Thickening Efficiency of HEUR on the Behavior of Two Different Latex Types
- Optimization of the Thickness of PET Bottles during Stretch Blow Molding by Using a Mesh-free (Numerical) Method
- An Experimental Setup to Measure the Transient Temperature Profiles in Water Assisted Injection Molding
- Experimental Investigation and Flow Modeling of Slippage Induced by Additives in Polyolefins in a Modular Co-rotating Twin Screw Extruder
- In-mold Melt Front Rate Control Using a Capacitive Transducer in Injection Molding
- Structural and Rheological Properties as a Function of Mixing Energy for Polymer/Layered Silicate Nanocomposites
- Study on Kneading and Molding of PP/TiO2 Nanocomposite
- Sustainable Biocomposites from Rice Flour and Sisal Fiber: Effect of Fiber Loading, Length and Alkali Treatment
- On-line Measurement Studies on Orientation Development and Characteristic Short-Period Diameter Fluctuation in High Speed In-line Drawing of Poly(ethylene terephthalate) Fiber
- Micro Replication by Injection-Compression Molding
- Utilizing Processing Parameters for Evaluating Polymer Viscosity during Plastication in Injection Molding
- PPS-News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Investigation of the Thickening Efficiency of HEUR on the Behavior of Two Different Latex Types
- Optimization of the Thickness of PET Bottles during Stretch Blow Molding by Using a Mesh-free (Numerical) Method
- An Experimental Setup to Measure the Transient Temperature Profiles in Water Assisted Injection Molding
- Experimental Investigation and Flow Modeling of Slippage Induced by Additives in Polyolefins in a Modular Co-rotating Twin Screw Extruder
- In-mold Melt Front Rate Control Using a Capacitive Transducer in Injection Molding
- Structural and Rheological Properties as a Function of Mixing Energy for Polymer/Layered Silicate Nanocomposites
- Study on Kneading and Molding of PP/TiO2 Nanocomposite
- Sustainable Biocomposites from Rice Flour and Sisal Fiber: Effect of Fiber Loading, Length and Alkali Treatment
- On-line Measurement Studies on Orientation Development and Characteristic Short-Period Diameter Fluctuation in High Speed In-line Drawing of Poly(ethylene terephthalate) Fiber
- Micro Replication by Injection-Compression Molding
- Utilizing Processing Parameters for Evaluating Polymer Viscosity during Plastication in Injection Molding
- PPS-News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
