• 제목/요약/키워드: Metalized Film

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A Welding Inspection of Small-sized Metalized Film Capacitor with Large Capacity (소형.대용량 Metalized Film Capacitor의 용접 오차 검출 개발)

  • Jeong, Won-Young;Oh, Choon-Suk;Ryu, Young-Kee;Lim, Jong-Seul;Lee, Seo-Young
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.135-137
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    • 2004
  • In this study we'll deal with the small-sized metalized film capacitors with large capacity which head have $5mm{\times}5mm{\times}2.5mm$ dimension. The lead wire is used to weld at both sides of capacitors. At that time the position gap between the welding machine and lead wire supplier would cause the welding error. Also, during the tapping processing of metalized film capacitors, the interval error among the capacitors, the length error of lead frame attached at the capacitors, and the straightness distortion of the lead frame could happen. As mentioned, four kinds of error parameters will be measured and analyzed by using the automatic visual inspection system that is implemented with CCD camera, optical parts, background lighting, and image processing algorithms. Finally we are able to achieve success rate above 99% to detect the welding faults of capacitors in the field test.

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Durability Improvement of Metal Convex Printing Plate for Securities Printing (유가증권 인쇄용 금속 볼록판의 내구성 향상에 관한 연구)

  • Lee, Hyok-Won;Kang, Young-Reep;Kim, Byong-Hyun
    • Journal of the Korean Graphic Arts Communication Society
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    • v.29 no.3
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    • pp.133-142
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    • 2011
  • We produce a photosensitive convex plate to research a Nickel metal relief printing plate using galvanic process. A Method for preparing DLC convex plate that is metalized on Nickel metal relief printing plate using CVD(Chemical Vapor Deposition) process and $N_2DLC$-convex plate that is DLC metalized thin film layer of $N_2$ plasma surface treatment are comprised. DLC thin film layers on Nickel surface are fragile. The results of the research indicate that the coefficient of friction on DLC metalized thin film layer is relatively low than Nickel surface and the durability of Nickel surface coated DLC metalized thin film layer is superior to Nickel surface. A relative evaluation of three form plate wetting properties using varnish liquid-drop plate indicates superior printing aptitudes for $N_2DLC$, DLC, Nichel plate order as above.

Development of the blended woven using fine-denier film fibers with alkali resistance property (내알칼리성 세데니어 필름사 제조를 통한 박지 필름 교직물의 개발)

  • Gwak, Seong-Hyeon;Park, Seong-U;Lee, Gwang-Tae;Park, Gi-Bung
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.143-144
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    • 2008
  • We developed that the film fibers which was vacuum-metalized silver on the PET film played a part increasing durable on the alkali, antibiotic and another functional property. For this usage, PET film fibers with fine denier vacuum-metalized silver manufactured through changing the micro slitting machine's drive process.

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Field Application to Evaluate the Effect of Various Surface Covered Curing Blankets on Temperature Profile and Crack Occurrence of the Concrete under Hot Weather Condition (서중환경에서 표면피복 양생재 종류변화가 콘크리트의 초기 온도이력 및 균열발생에 미치는 영향에 관한 현장적용성 평가)

  • Han, Min-Cheol;Lee, Sang-Woon
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.5
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    • pp.27-34
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    • 2018
  • Concrete placed under hot weather condition suffers from larger slump loss, rapid moisture evaporation due to high air temperature. Proper measures for material, transportation and curing should be taken to prevent the quality deterioration of the concrete under hot weather condition. In Korea, Although the period of hot weather concrete in Korea occupies only 2 months, there are a lot of quality problems including plastic, drying shrinkage and cold joint. Therefore, the objective of this paper is to investigate and compare the temperature history and crack occurrence of the concrete, which was placed in the actual apartment house construction field under hot weather condition, in response to the application of surface covered curing blankets including PE film, single layer clear bubble sheet, white colored bubble sheet and aluminum metalized bubble sheet. Test results indicated that the application of white colored bubble sheet and aluminum metalized bubble sheet showed most favorable results in terms of reduction in temperature rise and crack occurrence as well as easiness in handling. But, due to light reflection by aluminum metalized bubble sheet, it is believed that white colored bubble sheet is preferable.

A Stud on the Self Healing Characteristics of MPPF by Voids (보이드에 의한 MPPF의 셀프힐링 특성 연구)

  • 박하용;곽희로
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.4
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    • pp.77-82
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    • 2000
  • This paper describes the self healing characteristics of a metalized polypropylene film(MPPF) by voids under a.c condition. PDIVs were increased with the number of pre-self healing due to void defects, and several pre-self healing events took place at lower voltage than the critical breakdown voltage of a PPF. Self healing mainly occurred at pin tips, wrinkle sides, and cross points of wrinkles, and the main self healing voltage was increased with PPF thickness. The burn out area at self healing was increased with the applied voltage, and the peak currents in a grounding conductor at self healing was also increased with the applied voltage.

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Design and Fabrication of Metalized Film Capacitor for Power Electronics (전력전자용 건식 금속 증착 필름 커패시터 설계 및 제작)

  • Yoon, Jung-Rag;Kim, Young-Kwang
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1285_1286
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    • 2009
  • 본 논문에서는 지하철 인버터 회로에 사용 환경에 적합하면서 높은 과도 전압(dV/dt)에 견딜 수 있는 건식형 스너버용 커퍼시터를 설계 및 제작하여 특성을 검토하고자 한다. 필름 커패시터는 환경적 측면을 고려하여 에폭시 몰드형 건식형을 적용하였다. 증착 필름에 적용되는 금속은 Zn 전극에 비하여 Al 전극이 우수한 커패시터 특성을 나타내었으며 패턴의 경우에도 T-pattern에서 정전용량 및 손실의 변화율이 작게 나타났다. Al 금속전극에 wave-cut를 적용한 T - pattern 필름으로 DC 1650V, 12 uF, 정격전류 40 A의 커패시터를 제작하여 ESR 및 유전 손실이 적은 제품을 구현할 수 있으며 내구성 및 surge test 결과 신뢰성 규격을 만족하였다.

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The Electrical Characteristics of MPPF for Capacitor Applications under AC condition (커패시터용 MPPF의 교류전압 인가시 전기적 특성)

  • 정종욱;곽희로;박중신
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2000.11a
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    • pp.155-159
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    • 2000
  • This paper describes the self healing characteristics of metalized polypropylene film(MPPF) under ac condition. PDs were generally observed at relatively low voltage, and the PDIVs were differently varied depending on the number of pre-self healing due to void defects. Several pre-self healing events took place at lower voltage than the critical breakdown voltage of PPF. Self healing mainly occurred at pin tips, wrinkle sides, and cross points of wrinkles. The applied voltage at self healing was increased with PPF thickness. The burn out area at self healing was also increased with the applied voltage and PPF thickness. The peak currents in a grounding conductor at self healing was also increased with the applied voltage.

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A Study on the Fundamental Characteristics of Self-healing Metalized Polypropylene Films (금속증착 Polypropylene Film의 Self-healing 기초특성 연구)

  • Choi, Ki-Suck;Ryu, Sung-Sic;Jung, Jong-Wook;Park, Ha-Yong;Kwak, Hee-Ro
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2389-2391
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    • 1999
  • This paper describes the self-healing characteristics which plays an important role in high voltage capacitors. In this experiment, artificial voids were simulated in MPPFs, and the self-healing voltages were measured by varying the diameter of the voids and the thickness of the MPPFs. As a result, the self-healing voltage and the burn-out area were increased with the increment in the void diameter and the thickness of MPPF.

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The Self Healing Characteristics of MPPF for Energy Storage Capacitors (에너지저장 커패시터용 MPPF의 셀프힐링 특성)

  • Jung, Jong-Wook;Kwak, Hee-Ro;Park, Ha-Yong;Park, Jung-Shin;Kim, Young-Chan
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2110-2112
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    • 2000
  • This paper describes the self healing characteristics of a metalized polypropylene film(MPPF) used for energy storage capacitors. In the experiment, a d.c. voltage was applied to the MPPF, and the partial discharge inception voltages(PDIVs), the applied voltages at self healing, the burn out area and the current in the grounding conductor were measured and recorded. As a result, it was found that no PDs were found till the first pre-self healing occurred, and the applied voltage at self healing was increased with PPF thickness. Self healing was much more dependant on the shape of the air void than its diameter and the burn out area and the current in the grounding conductor at self healing was also increased with the applied voltage at self healing.

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Fabrication and Evaluation of a VHF Focusing Ultrasonic Transducer Made of PVDF Piezoelectric Film (PVDF 압전막을 이용한 초고주파 집속 초음파 트랜스듀서의 제작 및 특성 평가)

  • Yoon, Ju-Ho;Oh, Jung-Hwan;Kim, Jung-Soon;Kim, Moo-Joon;Ha, Kang-Lyeol
    • The Journal of the Acoustical Society of Korea
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    • v.30 no.4
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    • pp.215-222
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    • 2011
  • In order to obtain high resolution images, a focusing ultrasonic transducer operated in very high frequency (VHF) range was fabricated and its characteristics were evaluated. A 9-${\mu}m$ thick PVDF film with only one metalized surface for electric ground was adhered to a CCP (Copper-clad polyimide) film by using epoxy. It was pressed by a metal ball to form a concave surface and its rear side was filled with the epoxy. The radius of curvature and the f-number of the fabricated transducer are 7.5 mm and 1.7, respectively. The pulse-echo measurement results from a target located at the focal point showed that the frequency bandwidth was 35.0 MHz and the insertion loss near the peak frequency of approximately 40 MHz was about 60 dB. Those values agreed well with the simulation results by the KLM equivalent circuit analysis including the effect of the epoxy bonding layer. When the image of thin copper lines by the 35 MHz transducer of the UBM (Ultrasonic Backscattering Microscope) system was compared with the image by the transducer fabricated in this study, the fabricated transducer was observed that the axial resolution was improved although the lateral resolution was degraded.