• Title/Summary/Keyword: Micro-Molding

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Investigation on micro/nano filling behavior in LGP injection molding (LGP 사출성형 시의 미세충전 특성해석)

  • Cho, K.C.;Shin, H.G.;Kim, H.Y.;Kim, B.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.91-94
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    • 2006
  • In this paper, in order to get micro or nano size optical patterns, an analytical and experimental investigation on a LGP (light guide plate) injection molding process has performed. The LGP, which diffusing and emitting the light from the CCFL or the LEDs to the panel front direction uniformly, typically has an under 1mm thick base substrate and numerous 60 to $170{\mu}m$ width and 6 to $10{\mu}m$ thick dot patterns on it. Generally, the small size LGPs, for mobile devices, have been and are being made of PMMA through the injection molding process. However, the substrate thickness and the dot pattern size are decreasing, it becomes hard to fill the micro to sub-micro cavities completely. To investigate the flow behavior of resin in micro/nano cavities and identify the characteristics of the LGP injection molding process, we carried out the flow analyses with respect to the variations of the substrate thickness, the dot pattern size and the pitch of a cavity.

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A Study of Micro De-burring Characteristics using Polymer and $Al_2O_3$ Abrasive (폴리머와 산화알루미나 연마재를 이용한 마이크로 버 제거 특성에 관한 연구)

  • Sohn, Jong-In;Lee, Jeong-Won;Kim, Jun-Ki;Yoon, Gil-Sang
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.5
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    • pp.578-584
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    • 2011
  • In mechanical cutting process, burr was generated at workpiece by cutting tool generally. It is working disturbance during manufacturing process. Besides burr was taken shape relatively large size more micro scale machining than macro scale machining. Many researches have been studied to remove micro burr(de-burring), because it was negative effect for accuracy of machining shape. However, micro de-burring was constrained by burr height, micro feature and so on. In this paper, experimental research was carried out to compare de-burring characteristics of $Al_2O_3$ abrasive and polymer.

Effect of Molding Conditions on Demolding Force During Injection Molding of Parts with Micro-features (미세 패턴 사출 성형에서의 이형력에 대한 성형 조건의 영향 평가)

  • Park, S.H.;Yoo, Y.E.;Lee, W.I.
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.23 no.2
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    • pp.127-132
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    • 2014
  • Micro/nano-injection molding is one of the main processing techniques for polymer micro-fabrication. Most of the difficulties encountered in polymer micro-molding are caused by the demolding, rather than the filling of molds. Therefore, studying the demolding process is vitally important for manufacturing polymer replicas. The most important parameters are the thermal stress, friction and adhesion forces, and mechanical strength of the resist. In this research, we determinedthe effects of the processing conditions on the ejection force for cases involving two common thermoplastic polymers. The results showed that the processing conditions noticeably influenced the ejection force.

Development of Nano Mold and Injection molder for Nano system (나노 시스템 사출을 위한 차세대 전동식 사출기 개발 및 이를 위한 나노 몰드 개발)

  • 황교일;류경주;김훈모
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.189-192
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    • 2002
  • Recently, micro-nano system is fabricated by photolithograph method. This method can not have mass production, so this method wastes time and human effort. accordingly, the aim of this paper is to research on injection molding of micro-nano system. For injection molding process, development of micro-nano mold is required. Mold for injection mold process is maintained its shape in high pressure and temperature. So in this paper, we studied the simulation of mold fur injection molding and then we consider a result of injection molding simulation.

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Technical and Economical Comparison of Micro Powder Injection Molding

  • Atre, Sundar V.;Wu, Carl L.;Hwang, Chul-Jin;Zauner, Rudolf;Park, Seong-Jin;German, Randall M.
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09a
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    • pp.45-46
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    • 2006
  • In recent years, micro powder injection molding $(\mu-PIM)$ is being explored as an economical fabrication method for microcomponents in microsystems technology (MST). Technical and economic comparison was performed for $\mu-PIM$ processes. Molding experiment and simulation during the filling process were performed to evaluate several different geometries and processing conditions. The influence of material parameters and process conditions on mold filling were examined as a function of features size using microchannels as an example. It was found that the heat conductivity and viscosity of feedstock, geometry and mold temperature were the most critical parameters for complete filling of micro features.

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Relationship between Replication and Structure of Micro/Nano Molded Parts

  • Ito, Hiroshi;Kazama, Kunihiko;Kikutani, Takeshi
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.368-368
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    • 2006
  • Micro-molded parts can be defined as parts with microgram weight, parts with micro-structured surface, and parts with micro-precision. In this study, various micro-scale molded parts for various polymers were produced by using a precision micro-molding machine. Molded parts with nano-structure surface were also produced to analyze the effect of molding conditions on replication of surface pattern and higher-order structure development of molded parts. Replication of molded parts was influenced by material properties, molding conditions and size of surface pattern. Higher-order structure of molded parts was investigated by using polarized microscope. Skin-shear-core regions inside the molded parts were observed and shear region affected to surface replication.

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A numerical study on micro leakage behaviors at cavity edge during photo reaction injection molding (광반응사출성형 시 캐비티 엣지에서 발생하는 미세누출현상에 관한 해석적 연구)

  • La, Moon-woo
    • Design & Manufacturing
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    • v.10 no.3
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    • pp.8-13
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    • 2016
  • Despite technological advance, there have been several troubles in photo reaction injection molding (photo RIM) to produce ultra thin light guide panels (LGPs). In this study, micro leakage problem at cavity edge during photo RIM was investigated numerically. In order to obtain optimal processing conditions, we regulated inlet pressure of injected resin at the cavity edge and figured out micro leakage behaviors. At low inlet pressure (less than 100 Pa), though the micro leakage problem was not occurred, another problem, short shot due to not enough driving force, was appeared More than 1,000 Pa of the inlet pressure, injected resin was rapidly leaked through the micro gap at the cavity edge. Finally, we obtained optimal inlet pressure around 600 ~ 1,000 Pa. At this region, injected resin fully filled the cavity without micro leakage behavior. Based on the present study, further comparative investigations with experimental photo RIM should be performed to find optimal processing conditions for produce ultra thin LGPs.