• Title/Summary/Keyword: Micro Molding

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Integrated Numerical Analysis of Induction-Heating-Aided Injection Molding Under Interactive Temperature Boundary Conditions (열-유동 상호작용을 고려한 유도가열 적용 미세 사출성형의 통합적 수치해석)

  • Eom, Hye-Ju;Park, Keun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.5
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    • pp.575-582
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    • 2010
  • In recent years, several rapid-mold-heating techniques that can be used for the injection molding of thin-walled parts or micro/nano structures have been developed. High-frequency induction heating, which involves heating by electromagnetic induction, is an efficient method for the rapid heating of mold surfaces. The present study proposes an integrated numerical model of the high-frequency induction heating process and the resulting injection molding process. To take into account the effects of thermal boundary conditions in induction heating, we carry out a fully integrated numerical analysis that combines electromagnetic field calculation, heat transfer analysis, and injection molding simulation. The proposed integrated simulation is extended to the injection molding of a thin-wall part, and the simulation results are compared with the experimental findings. The validity of the proposed simulation is discussed according to the ways of the boundary condition imposition.

A Study on the Effect of Optical Characteristics in 2 inch LCD-BLU by Aspect Ratio of Optical Pattern: II. Mold and Optical Characteristics (휴대폰용 2인치 LCD-BLU의 광특성에 미치는 광학패턴 세장비의 영향 연구 : II. 금형 및 광특성)

  • Kim, J.S.;Ko, Y.B.;Yu, J.W.;Min, I.K.;Hwang, C.J.;Yoon, K.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.95-98
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    • 2006
  • LCD-BLU (Back Light Unit) is one of kernel parts of LCD unit. The fabrication method of a 3-D micro mold patterned with micro-lenses for the LGP (Light Guiding Plate), one of the most important parts of LCD-BLU, was presented. Instead of dot pattern made by etching, 3-D optical pattern design with $50{\mu}m$ micro-lens was applied in the present study. The micro-lens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP. The positive micro-lens patterned injection mold with different aspect ratios (i.e. 0.3 and 0.4) was fabricated with modified LiGA with thermal reflow process. The brightness of LCD-BLU increased as aspect ratio of micro-lens increased.

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Fabrication of micro injection mold with modified LIGA micro-lens pattern and its application to LCD-BLU

  • Kim, Jong-Sun;Ko, Young-Bae;Hwang, Chul-Jin;Kim, Jong-Deok;Yoon, Kyung-Hwan
    • Korea-Australia Rheology Journal
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    • v.19 no.3
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    • pp.165-169
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    • 2007
  • The light guide plate (LGP) of LCD-BLU (Liquid Crystal Display-Back Light Unit) is usually manufactured by forming numerous dots by etching process. However, the surface of those etched dots of LGP is very rough due to the characteristics of etching process, so that its light loss is relatively high due to the dispersion of light. Accordingly, there is a limit in raising the luminance of LCD-BLU. In order to overcome the limit of current etched-dot patterned LGP, micro-lens pattern was tested to investigate the possibility of replacing etched pattern in the present study. The micro-lens pattern fabricated by the modified LiGA with thermal reflow process was applied to the optical design of LGP. The attention was paid to the effects of different optical pattern type (i.e. etched dot, micro-lens). Finally, the micro-lens patterned LGP showed better optical qualities than the one made by the etched-dot patterned LGP in luminance.

Properties of PZT Ultrasonic Transducer Array Fabricated by Micro-Pressing and Dicing method (Micro-Pressing 방법과 Dicing 방법에 의해 제조된 PZT Ultrasonic Transducer Array의 특성)

  • Park, Joon-Shik;Hong, Sung-Jei;Cho, Jin-Woo;Park, Soon-Sup;Han, Jin-Ho
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2248-2250
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    • 2000
  • We investigated properties of PZT composite for medical ultrasonic transducer array (briefly UTA) for medicine applications fabricated by micro pressing and dicing method. Dicing method was the fabrication process of conventional ultrasonic transducer array by dicing sintered PZT sheet. Micro pressing method was the proposed process using pressing PZT green sheet by PMMA micro mold from LIGA process. Microstructures, electrical and electro -mechanical properties of fabricated UTAs of two cases were analyzed. Thickness mode electro-mechanical coupling coefficient of two cases have same values of 51%. Sintered PZT Microstructures of them showed dense and uniform. Micro pressing method was very mass productive process because of using batch type LIGA process. From results, we found micro pressing method was more competitive than dicing method for UTA fabrication. For further study, uniformity of microstructures and electro-mechanical properties of large scale, and fabrication processes of Ni plating and PMMA molding should be improved and investigated.

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