• Title/Summary/Keyword: roll technique

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Effect of Substrate Preheating on the Characteristics of Flexible and Transparent ITO Electrodes Grown by Roll-to-Roll Sputtering for Touch Panel Applications (기판 열처리가 롤투롤 스퍼터를 이용하여 성장시킨 터치 패널용 유연 ITO 투명 전극의 특성에 미치는 효과 연구)

  • Kim, Dong-Ju;Lee, Won-Young;Kim, Bong-Seok;Kim, Han-Ki
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.4
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    • pp.327-332
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    • 2010
  • We report on the effect of PET substrate preheating on the characteristics of the flexible and transparent indium tin oxide (ITO) electrode grown by a specially designed roll-to-roll sputtering system for touch panel applications. It was found that electrical and optical properties of the roll-to-roll sputter grown ITO film were critically dependent on the preheating of the PET substrate. In addition, the roll-to-roll sputter-grown ITO film after post annealing test at $140^{\circ}C$ for 90 min showed stable electrical and optical properties. The low sheet resistance and high optical transmittance of the ITO film grown on the preheated PET substrate demonstrate that the preheating process before ITO sputtering is one of the effective way to improve the characteristics of ITO/PET film. Furthermore, the superior flexibility of the ITO electrode grown on the preheated PET substrate indicates that the preheating treatment is a promising technique to obtain robust ITO/PET sample for touch panel applications.

A Time-Redundant Recovery Policy of TMR Failures Using Rollback and Roll-forward (Rollback과 Roll-forward 기법을 사용한 TMR 고장의 시간여분 복구 정책)

  • Yun, Jae-Yeong;Kim, Hak-Bae
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.1
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    • pp.216-224
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    • 1999
  • In the paper we propose two recovery methods by adopting a rollback and/or roll-forward technique (S) to recover TMR failures in a TMR (structured ) system that is the simplest spatial redundancy. This technique is apparently effective to recovering TMR failures primarily caused by transient faults. The proposed policies carry out few reconfigurations at the cost of (minimal) time-overhead needed for those time-redundant schemes. The optimal checkpoint-interval vectors are derived for both methods through the likelihoods of all (possible) states of the system as well as the total execution-time. Consequently the effectiveness of our proposed policies is validated through certain numerical examples and simulations.

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A Study on Forming of Micro Rib Barriers by Roll Forming Technique (롤 포밍에 의한 미세 격벽 성형에 대한 연구)

  • Park, Jong-Jin;Hwang, Han-Sub
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1136-1141
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    • 2003
  • Among various methods to manufacture the PDP barrier ribs, the pressing and the roll forming methods are simple and economical because they form the ribs by utilizing the plastic flow of the green tape in a relatively short time without generating air-polluting dusts. In the present study, the roll forming method was investigated by experiments as well as numerical analyses and in result the groove roll and the preform were designed. The effect of draft angle, comer radius, and initial thickness of the green tape on the plastic flow was examined by a series of parametric studies. The preform was recommended to ease the plastic flow into the grooves and to avoid the occurrence of crack during rolling and sintering processes.

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Matching Technology Between Nip Roll Characteristics and Quality of Print Pattern in Roll-to-Roll Printed Electronics Systems (롤투롤 전자인쇄 시스템에서 Nip Roll 의 특성에 따른 인쇄 패턴의 품질에 대한 매칭기술 연구)

  • Choi, Jea-Won;Shin, Kee-Hyun;Lee, Chang-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.2
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    • pp.173-178
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    • 2012
  • Currently, active research is being performed on printing of electronic devices such as RFID devices, flexible displays, solar cells, and e-paper. This technique has several advantages over existing technologies such as lithography and etching. In particular, RFID devices, flexible displays, solar cells, and e-paper require flexibility and a mass production system. Thus, attention is being focused on the roll-to-roll process. High quality should be guaranteed in the roll-to-roll printed electronics systems, and good thickness and roughness qualities must be ensured. Experimental design was applied to this problem to analyze the main effects and interaction effects of various factors. Matching technology between the nip roll characteristics and the quality of the print pattern in roll-to-roll printed electronics systems was proposed to improve the printing quality.

Analysis of Ink Transfer for R2R Printing Process with High Speed Operation and Complex Roll Patterns (고속 웹 이송속도 및 복잡한 롤 패턴 형상을 고려한 R2R공정에서의 잉크전달 특성 해석)

  • Kim, Kyung-Hun;Kim, So-Hee;Na, Yang
    • Journal of the Semiconductor & Display Technology
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    • v.9 no.2
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    • pp.55-60
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    • 2010
  • Ink transfer process from the printing roll to the moving web was investigated using a CFD technique for the application in R2R printed electronics. In line with the requirement that the web handling speed needs to be increased further for the cost competitiveness, the effects of web moving velocity with relatively complex roll patterns were analyzed. To make the present analysis more realistic, the numerical geometry and the ink properties were selected to match those of the real printing production system. Our numerical results showed that both web handling speed and complex printing-roll patterns influenced the shape of the transferred ink. As the web moving speed approaches towards 30mpm, a significant distortion of the shape of the transferred ink occurred. In the range of pattern width smaller than 100 microns, a phase distortion was also found to occur in all the printing-roll patterns considered in the present work but the ratio of the phase distortion to the line width gets smaller as the width becomes smaller. Thus, the web handling speed and the shape of printing-roll pattern will be important elements for the better printing quality under 100 micron line width range.

Development of Technique Predicting of the Wear of DCI Roll Using Carbon Steel in Hot Rod Rolling Process (탄소강 선재 압연공정의 DCI 롤 마멸 예측 기술의 개발)

  • Kim, Dong-Hwan;Kim, Byeong-Min;Lee, Yeong-Seok;Yu, Seon-Jun;Ju, Ung-Yong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.9
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    • pp.1736-1745
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    • 2002
  • The objective of this study is to predict the roll wear in hot rod rolling process. In this study hot rod rolling process for round and oval passes has been investigated. In order to predict the roll wear, the wear model is reformulated as an incremental form and then wear depth of roll is calculated at each deformation step on contact area using the results of finite element analysis, such as relative sliding velocity and normal pressure at contact area. Archard's wear model was applied to predict the roll wear. To know the thermal softening of DCI (Ductile Cast Iron) roll according to operating conditions, high temperature micro hardness test is executed and a new wear model has been proposed by considering the thermal softening of DCI roll expressed in terms of the main tempering parameter curve. 3D wear program developed in this study might be used for adjusting the gap of rolls to set up a suitable rolling schedule for keeping dimensional tolerance of the product.

Parameter Analysis for the Lateral Thickness of the Coated Layer to Improve Product Quality in Large Area Roll-to-Roll Slot-Die Coating Process (대면적 롤투롤 슬롯-다이 코팅의 횡 방향 두께 품질 개선을 위한 공정 파라미터 분석)

  • Park, Janghoon;Lee, Changwoo
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.2
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    • pp.159-166
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    • 2015
  • Slot-die coating is well known technique to guarantee a uniformly coated layer and is compatible with roll-to-roll process. In actual roll-to-roll slot-die coating process, the lateral difference of coated layer thickness is observed. An experimental study was performed to improve the coating quality. Coating speed and coating gap were selected as the experimental factors. A full factorial, statistical method was conducted to optimize the process conditions. Based on the results of repeated experiment, the lowest deviation of lateral thickness (700 nm, <10%) was achieved at 10 m/min coating speed and $300{\mu}m$ coating gap. This result has significance because such optimized process guideline can be utilized with all process improvement in various coating applications.

Application of Regression Analysis for Quality Control In Suspension Manufacturing

  • Ritthidetch, Thammasak;Masuchun, Ruedee;Chaikla, Amphawan;Julsereewong, Prasit;Tirasesth, Kitti
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.704-709
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    • 2004
  • This paper presents the laser processing to adjust the roll and pitch directions of the flex suspension assembly for hard disk drive production. The adjustment is accomplished using a number of laser beam projections that can be approximated using the regression model of the existing measured roll and pitch directions. Information derived from the analysis can be applied to control the quality of flex suspension assembly. The performances of the proposed technique were observed using the flex suspension assembly plant in Thailand as an illustrative case study. The experimental results are given to support the improving manufacturing yields and some economic benefits of the proposed technique.

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A Study on the Effect of Roughness of Rolling Roll in the Paintabilility of Strip (압연롤의 조도가 박판의 도장성에 미치는 영향에 관한 연구)

  • 김순경
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.7
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    • pp.36-43
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    • 1998
  • Surface roughness of cold rolled steel sheet as well as the coating technique itself is quite important in obtaining high image clarity of electronic products and car outer panels. Especially, surface characteristics of steel sheet have acquired increasing attention from the steel and automotive industries. While the influence of such characteristics on paintability formability and painted surface appearance is important in defining steel surface requirements for automotive industries. Therefore this paper is dedicated primarily to the issue of paint appearance and reviews for improvement of roughness and peak count about the surface of work roll for the actual temper mill. The conclusions were obtained as follows ; 1) Roughness and peak count about the surface of steel sheet is strongly affected by surface condition of work roll. 2) The electro-discharge textured roll has more uniform roughness distribution than shot blasted roll and it's painted appearance of steel sheet has more improvement than that of the shot blasted because it has more harmonic wave roughness, and the higher peak count of surface roughness.

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A Study on the Texturing Characteristics of Work Roll and Variation of Strip Surface Roughness in 4-Hi Mill (4단 압연기용 작업롤의 표면조도가공 특성과 판면조도 변화에 관한 연구)

  • Kim, Moon Kyung;Jeon, Eon Chan;Kim, Soon Kyung
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.7
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    • pp.167-175
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    • 1996
  • Work roll wear in the cold rolling of steel strip is strongly affected by rolling materials, rolling conditions and lubrication. Tests were performed to find the effects of rolling materials under the same lubricating conditions. Surface roughness of cold rolled steel strip as well as the coating technique itself is quite improtant in obtaining high image clarity of electronic products and car outer panels. Therefore this paper reviews for improvement of roughness and peak count about the surface of Cr coated work roll is investigated from the actual temper mill. The conclusions were obtained as follows; 1) Work roll wear in the cold rolling of steel strip is strongly affected by carbon contents of rolling materials, but there is not a separating force and total reduction ratio. 2) The roughness of strip surface is larger in the direction of width than in roll direction. 3) The electro-discharge textured roll has more uniform roughness distribu- tion than shot blasted roll and it's life time is two times longer than shot blasted because it has more harmonic wave roughness, and the higher peak count of surface roughness. 4) The life time of Cr coated work roll is 2 times longer than that of shot blasted work roll and variation of peak count, roughness and life time of Cr coated work roll is similar to electro-discharge texturing work roll. 5) The proper Cr coating thickness is 10 .mu. m at the work roll of temper mill.

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