• Title, Summary, Keyword: Stripper

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A Study on the Characteristics and Cleanliness of Fluidic Strip Process of Environment-Friendly Aqueous Stripper (친환경 수계 박리액의 유동박리 공정 특성 및 청정성 연구)

  • Lee, Ki-Seong;Lee, Jaeone;Kim, Young Sung
    • Clean Technology
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    • v.24 no.3
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    • pp.175-182
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    • 2018
  • In this research, we investigated the cleanliness by optimizing the water content of the aqueous stripper in fluidic strip process. The stripping properties of the photoresist with optimized aqueous stripper were compared with the commercial organic stripper. The stripping performance was evaluated by electrical and optical characteristics on the surface of the transparent electrode that compare with stripped the transparent electrode surface and the rare surface before patterning by the photoresist. As a result of the photoresist stripping process of the organic stripper and the aqueous stripper optimized for water content, the aqueous stripper exhibited better electrical and optical characteristics than the organic stripper. In the case of the fluidic strip process with organic stripper, the photoresist dissolves in the stripper solution during stripping which can cause re-adsorption by contamination. Whereas that the aqueous stripper under development seems to decrease the photoresist dissolution in the stripper solution. Because the cyclodextrin contained in the stripper captures organic photoresist into hall of cyclodextrin which stripped through swelling and tearing. The photoresist residue captured by the cyclodextrin can be filtered. After the fluidic stripping process by different chemical stripping mechanism, the cleanliness of the organic stripper and aqueous stripper was compared and analyzed.

Analysis of Minor Additives and Polymer in Used-stripper Using Pyrolysis-Gas Chromatography/Mass Spectrometry and Electrospray Mass Spectrometry

  • Koo, Jeong-Boon;Park, Chang-Hyun;Han, Cheol;Na, Yun-Cheol
    • Bulletin of the Korean Chemical Society
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    • v.30 no.2
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    • pp.368-372
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    • 2009
  • The trace polymer and additives in used stripper solutions were analyzed by a combination of Py-GC/MS and ESI-MS. In the comparison of the pyrolysates produced by the pyrolysis of the pure stripper and photoresist at $500{^{\circ}C}$, the presence of novolac polymer in the used stripper was confirmed by the presence of the characteristic peaks of its pyrolysates, such as those of the methylphenol, di-methylphenol and methylenebis(methylphenol) isomers. The intact trace polymer was measured by ESI-MS, which showed the distribution of oligomers at intervals of 120 Da, indicating di-methylphenol to be the repeat unit. Additional MS/MS measurements demonstrated that the end group is methylphenol and the repeat groups are di-methylphenol. Some modified oligomers caused by the methylation or di-methylation of the repeat unit were also identified. Although the polymer is only present at a trace level in the used stripper, these combined analytical methods provided the means to qualify the stripper solution through the identification and structural determination of the polymer.

Controllability Evaluation and Tuning of Gas Stripper System (탈기기계통의 제어성 평가와 튜닝)

  • Lee, Kwang-Dae;Yang, Seung-Ok;Oh, Eung-Se
    • Proceedings of the KIEE Conference
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    • pp.638-640
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    • 2004
  • The gas stripper system of a nuclear power plant provides gas-free water to a reactor and a turbine system. The gas tripper unit has two control systems to regulate pressure and level independently. Because the level and the pressure interact as a control disturbance each other, continuous operation of the system is difficult. In this paper, We describe the controllability evaluation of the gas stripper system and the results of the optimally tuned control gains.

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A Study on the Blanking Characteristic of Anti- Vibration Sheet Metal (제진 강판의 블랭킹 가공 특성에 관한 연구)

  • 이광복;이용길;김종호
    • Transactions of Materials Processing
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    • v.12 no.8
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    • pp.724-729
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    • 2003
  • In order to study the shearing characteristic of anti-vibration sheet metal which is used to reduce vibration noise, a blanking die was manufactured to blank a workpiece. The variables employed in this study were clearance, type of stripper plate, position of the rubber layer and type of the die design. These variables were used to study the effects on burr height, blank diameter and camber height. In the case of burr height from experimental investigation, the push-back die, combined with a movable stripper plate, showed greater burr height. The rubber-top position of a workpiece resulted in better qualities regardless of working variables. In the comparison of diameter measurement, the use of the push-back die with a fixed stripper plate, with a 4.5% clearance, showed better accuracy. For comparing camber height, the push-back die resulted in less cambering than the drop-through die. Also, the larger the clearance, the greater was the camber height. Considering experimental results, the shearing of anti-vibrational sheet metal is best achieved when the rubber layer is laying on the top, blanked with a fixed stripper plate in a push-back die, with a 4.5% clearance.

Minimization of Energy Consumption for Amine Based CO2 Capture Process by Process Modification

  • Sultan, Haider;Bhatti, Umair H.;Cho, Jin Soo;Park, Sung Youl;Baek, Il Hyun;Nam, Sungchan
    • Journal of Energy Engineering
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    • v.28 no.4
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    • pp.13-18
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    • 2019
  • The high energy penalty in amine-based post-combustion CO2 capture process is hampering its industrial scale application. An advanced process is designed by intensive heat integration within the conventional process to reduce the stripper duty. The study presents the technical feasibility for stripper duty reduction by intensive heat integration in CO2 capture process. A rigorous rate-based model has been used in Aspen Plus® to simulate conventional and advanced process for a 300 MW coal-based power plant. Several design and operational parameters like split ratio, stripper inter-heater location and flowrate were studied to find the optimum values. The results show that advanced configuration with heat integration can reduces the stripper heat by 14%.

A Study of Optimization in the Queue, Finite Population (유한모집단 대열기법에 의한 최적화 연구)

  • 오충환
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.1 no.1
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    • pp.37-44
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    • 1978
  • The purpose of this study is to search for an efficient application method in solving delay-phenomenon problems which influence upon total production cost through case study. The method of this study is an experimental study based on cutting time data in lead cutting operations from "Lead Cutting Machine (Stripper)" and its service rate data from a large electronic products company which utilizes conveyor line system for the products "Car Stereo" The procedure of this experimental study is as follows; 1) Using loading(Man-Hour) analysis technique j,1 order to analyse and evaluate Production capacity, efficiency, operation and idle rate assembly charge, waiting and service cost -when its are controlled by stripper operator(server) 2) Establishing adequate waiting time model of finite population caused by the interference of 4 stripper machine which is drawn from mathematical statistics testing, that is, goodness of fit test in the waiting and service rate and to search for optimal solution by utilizing the above mentioned model The experimental result was that amount to 8,546,618won Per year was brought down, that is, by optimum point, it shows a decrease as compared with Present point. The major limitation of this experimental study is that the Queue in the Finite Population, so to speak. it comes from the interference of 4 stripper machine dealt with this case were limited only on the Car Stereo conveyor line. Further study of application of this application method to the areas such as material handling, personnel management marketing and transportation management is strong1y recommended.trong1y recommended.

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A Study on the Blanking Characteristic of Anti- Vibration Sheet Metal (제진 강판의 블랭킹가공 특성에 관한 연구)

  • Lee K. B.;Lee Y. G.;Kim J. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.29-34
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    • 2003
  • In order to study the shearing characteristics of anti-vibration sheet metal which has been bonded by resin, a blanking die of 40.02mm was manufactured to blank a material and it is used to reduce vibrational noise. The variables employed in this study were 1) Clearance 2) types of stripper plate, and 3) types of the die design technique. These variables were used to study the effects on burr height, diameter of product, and camber height. Lastly, the effect of the position of the rubber during blanking was observed. In the case of burr height from experimental investigation, the push-back die, combined with a movable stripper plate, resulted in the concentration of additional pressure between the cutting edges, meaning the crack initiation was delayed. This result was not affected by lubrication, although appropriate lubrication is preferred to enable a longer lasting die in terms of wear, which results from the presence of adhesive as the sheet metal is blanked. In the comparison of diameter measurement, the push-back die, combined with the back pressure from the knock-out plate showed a favorable precision. The use of the push back die with a fixed stripper plate, with a $4.5\%$ clearance, showed better accuracy in the diameter measurement. For comparing camber height, the push back die resulted in less cambering than the drop-through die. Also, the larger the clearance, the greater was the camber height. Considering experimental results, the shearing of anti-vibrational sheet metal is best achieved when the rubber is laying on the top, blanked with a fixed-stripper plate in a push-back die, with a $4.5\%$ clearance.

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Trend on the Recycling Technologies for the waste stripper solution by the Patent Analysis (특허(特許)로 본 스트리핑 공정(工程) 재활용(再活用) 기술(技術) 동향(動向))

  • Park, Myung-Jun;Lee, Ho-Kyung;Koo, Kee-Kahb;Kang, Kyung-Seok;Han, Hye-Jung
    • Resources Recycling
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    • v.18 no.1
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    • pp.58-67
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    • 2009
  • The annual requirement of domestic waste photoresist stripper solution is about 1 trillion won level (50,000 tons) depends entirely on imports for its supplies. Nevertheless, there waste strippers which contain the impurities have been recycled or incinerated to a low level of recycle. These days the recycling technologies of the waste stripper solution has been widely studied from the view points of economy and efficiency. In this paper, the recycling technologies on patent of the waste stripper solution were analyzed. The range of search was limited within the open patents of USA (US), European Union (EP), Japan (JP), and Korea (KR) up to september, 2007. Patents have been collected using key-words searching and filtered by filtering criteria. The trends of the patents was analyzed by the years, countries, companies, and technologies.

The Prediction of Defection for the Shape Fixability on the Stamped Lead Frame (반도체 리드프레임의 형상 동결성에 관한 연구)

  • Cho H. K.;Kim D. H.;Lee S. B.;Kim B. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.77-80
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    • 2001
  • IC lead frame needs the precision shape for good efficiency. In the blanking process, there are many parameter effected the dimensional accuracy : lead width, blanking order, striper force, tool clearance etc. In this research, the4 undesirable defects appeared in the final blanking process. so we measured the deflection of lead according to the stripper force using $PAM-STAMP_{TM}$. In the result, the deflection was decreased by increasing the stripper force properly. and we changed the blanking order on the test model. In the blanking order, deflection is good from the outer line position blanking to center line position. so we can design the precision die without tryout by the prediction of the lead deflection.

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Study of Uniform Beam Formation at ISOL Target Using TRANSPORT

  • Hong, Seong-Gwang;Kim, Jae-Hong;Kim, Jong-Won
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.174.2-174.2
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    • 2013
  • 사이클로트론에서 가속된 70 MeV 양성자 빔은 stripper에서 인출된 후 ISOL 표적에 조사하게 된다. 이 때 희귀동위원소를 생산하기 위한 ISOL 표적의 온도는 평균 $2,000^{\circ}C$ 5%로 유지하여야 한다. 사용하고자 하는 원판형태의 우라늄 표적은 직경이 45 mm 이므로 50 mm 이상의 균일한 양성자 빔이 필요하다. 본 연구에서는 stripper에서부터 ISOL 표적 까지 빔전송에 필요한 최적 조건을 연구하였다. 총 길이는 15 m 이며 두 개의 dipole을 사용하여 빔을 90도 전환시키며 3개의 4중극전자석을 사용하였다. ISOL 표적에 균일한 빔을 조사하기 위해 wobbling 방법을 활용하여 직경 50 mm 의 균일빔을 발생하고자 한다. 빔 전송 프로그램 TRANSPORT을 이용하여 stripper에서 wobbler 전까지의 빔 광학을 계산한 결과를 보고자 하고 TRANSPORT의 결과를 TURTLE 프로그램에 적용시켜 ISOL 표적에서의 균일도를 5% 미만으로 유지하는 최적조건을 발표한다.

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